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Explanation of mechanical feature?

Author: Micke Isotalo ★2017
Date: 2025-06-08 18:26
Attachment: Backun_Alpha_BC_Nozzle_1.jpg (585k)
Attachment: Backun_Alpha_BC_Nozzle_2.jpg (552k)

What's the function or purpose of this nozzle-like feature, seen on the attached pictures? On the long axle I could imagine an oiling nozzle (not sure though), but on the adjustment screw barrel for the neck mechanism? These are on a Backun Alpha bass, and there are several at different locations.

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Re: Explanation of mechanical feature?

Author: Chris P
Date: 2025-06-08 18:33

Grub screw by the looks of it - Conn used to use them on their saxes to keep the pivot screws locked in place (and G.R.Uebel used them too).

Both a blessing and a curse - blessing as they can keep certain screws locked in place if the threads aren't in tension and a curse if someone doesn't undo them when removing the screws, or if they haven't got the correct size Allen key or hex driver that fits them, or they've been over torqued and mash up the screw threads or dent the rod screw and kick up a burr on it.

Former oboe finisher
Howarth of London
1998 - 2010
The opinions I express are my own.

Post Edited (2025-06-08 18:34)

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Re: Explanation of mechanical feature?

Author: Micke Isotalo ★2017
Date: 2025-06-08 20:50

Thanks a lot Chris. Yes, a hexagonal H0.7 driver was suitable. I guess I already damaged the threads of that adjustment screw for the neck mechanism a bit, while turning it without loosening that locking screw first (at least it still turns enough for adjustments both up and down, but I can't unscrew it completely). Thanks to your advice, I at least won't continue damaging other screws.

Equipped with proper knowledge and tools, I definitely appreciate this feature since adjustment- and other screws living their own life is definitely a curse.

Must be demanding and time consuming for the manufacturer installing these infinitesimal locking screws. Never before seen such on any other instrument. Also nice that this feature is included on the more budget friendly Alpha, and not only on the more expensive Q bass.

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Re: Explanation of mechanical feature?

Author: Bennett ★2017
Date: 2025-06-08 22:58

British Empire English GRUB screw = American English SET screw

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