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B&S Challenger Stop Nut Size



 
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Alex Domeier
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Joined: 14 Apr 2016
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Location: Charlotte NC

PostPosted: Sat Aug 05, 2017 10:48 am    Post subject: B&S Challenger Stop Nut Size Reply with quote

This may have already been asked at some point, but is anyone aware of the stop nut size of a B&S Challenger 3137, and where I might purchase one. Mine rolled off and away somewhere and I'd like to get another before my 3rd valve slide falls off and gets a dent. Since it's a German based horn I believe the tread size is measured using metric which means I can't substitute a Bach stop nut.

Thanks
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Alex Domeier
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James Becker
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PostPosted: Sun Aug 06, 2017 4:08 am    Post subject: Reply with quote

I can confirm the thread pitch when I get to the shop tomorrow. We ordered replacements from B&S so e can supply you what you need. I'll post on Monday.
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James Becker
Brass Repair Specialist Since 1977
Osmun Music Inc.
77 Powdermill Road Rt.62
Acton, MA 01720
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Our workshop is as close as your nearest UPS store https://www.ups.com/dropoff?loc=en_US
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Irving
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PostPosted: Sun Aug 06, 2017 5:27 am    Post subject: Reply with quote

Even though the Challenger is a Bach Strad copy, B&S made sure that nothing is interchangeable between the two.
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oxleyk
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PostPosted: Sun Aug 06, 2017 6:13 am    Post subject: Reply with quote

You could take it to a local tech and see if they have any that fit--just ask. You may also be able to replace the stop rod with one that has Bach threads. You could also replace the Bach-style stop with a Yamaha-style stop screw. There are multiple options here. An elastic hair band would work in a pinch.

Another place to look is your local hardware store, one that stocks small parts like this.

Kent
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James Becker
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PostPosted: Sun Aug 06, 2017 6:27 am    Post subject: Reply with quote

Yes, I've swapped out a Bach rod on a B&S, but the portion that inserts into the post must be turned down to a smaller diameter to fit.
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James Becker
Brass Repair Specialist Since 1977
Osmun Music Inc.
77 Powdermill Road Rt.62
Acton, MA 01720
www.osmun.com

Our workshop is as close as your nearest UPS store https://www.ups.com/dropoff?loc=en_US
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James Becker
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PostPosted: Sun Aug 06, 2017 6:29 am    Post subject: Reply with quote

Another solution involves chasing a Bach nut with a metric tap, again I can tell you more once I have the measurements tomorrow.
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James Becker
Brass Repair Specialist Since 1977
Osmun Music Inc.
77 Powdermill Road Rt.62
Acton, MA 01720
www.osmun.com

Our workshop is as close as your nearest UPS store https://www.ups.com/dropoff?loc=en_US
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TheBrassBandMajor
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PostPosted: Sun Aug 06, 2017 7:02 am    Post subject: Reply with quote

You can use Bach nuts.
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Alex Domeier
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Joined: 14 Apr 2016
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Location: Charlotte NC

PostPosted: Sun Aug 06, 2017 9:21 am    Post subject: Reply with quote

Thanks to all for the responses. I'll borrow someones Bach nut and test it to see if it fits. If I have the measurements then I'll just go to the hardware store and by a few or so. That way if one falls off I can just replace it.
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Alex Domeier
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James Becker
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PostPosted: Sun Aug 06, 2017 6:36 pm    Post subject: Reply with quote

TheBrassBandMajor wrote:
You can use Bach nuts.


No actually. Bach nuts have a 5-40 pitch internal thread and will not fit the B&S metric threaded rod. Per my previous two posts, one would have to change the internal threads of the Bach nuts to metric thread pitch with the correct tap or adapt a Bach 5-40 stop rod to fit the B&S stop post. Either way requires some sort of alteration to make the Bach parts fit. I know this because we've done both successfully.

I hope this is helpful.
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James Becker
Brass Repair Specialist Since 1977
Osmun Music Inc.
77 Powdermill Road Rt.62
Acton, MA 01720
www.osmun.com

Our workshop is as close as your nearest UPS store https://www.ups.com/dropoff?loc=en_US
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James Becker
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PostPosted: Mon Aug 07, 2017 7:39 am    Post subject: Reply with quote

Here you go:

B&S stop rod and nut threads are M3 x .5

Rod diameter is 3mm = .118" vs Bach at 1/8" = .125"

We have genuine B&S stop nuts in silver plate available. The price is nearly twice that of Bach which is why customers will often have us chase the internal threads of a Bach nut. So the choice is yours.

So far we haven't found any hardware stores that stock knurled nuts in this specific size.

I hope this is helpful.
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James Becker
Brass Repair Specialist Since 1977
Osmun Music Inc.
77 Powdermill Road Rt.62
Acton, MA 01720
www.osmun.com

Our workshop is as close as your nearest UPS store https://www.ups.com/dropoff?loc=en_US
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Alex Domeier
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Joined: 14 Apr 2016
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Location: Charlotte NC

PostPosted: Mon Aug 07, 2017 11:36 am    Post subject: Reply with quote

Thank you James. I'll try our local hardware store just in case to see if I can find a nut there and save myself a little money, but if I have no luck there I may go to you. Do I go to your website and look from the online store there to order a nut or is there a better route I should take.
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Alex Domeier
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James Becker
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PostPosted: Tue Aug 08, 2017 7:02 am    Post subject: Reply with quote

OK, our store manager will be adding B&S stop nuts to our website. You can expect to find them here in the next day or so. http://www.osmun.com/care/parts.html?cat=285
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James Becker
Brass Repair Specialist Since 1977
Osmun Music Inc.
77 Powdermill Road Rt.62
Acton, MA 01720
www.osmun.com

Our workshop is as close as your nearest UPS store https://www.ups.com/dropoff?loc=en_US
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