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Re: bending a post

Author: clarnibass
Date: 2016-10-23 12:00

>> Using a belt hole punch you can make a spacer with teflon sheet and insert between the post and key tube to take up excess play. <<

There are a few problems with that. It's really easy to lose it when disassembling the key again. More important, the accuracy of a realistic difference in thickness of teflon spacers is no where near the accuracy usually aimed for key fit (unless you use 0.015mm thick sheet and even that is borderline and makes the entire thing a lot more messy). Most important, this key has a hinge rod with pivot screws (on almost all clarinets) so adding shims wouldn't solve the problem of the key being loose around the screw, which is the main problem and the important part.

>> The reason I ask is that the correct way to do this would be to swage (or swedge on your side of the pond) the hinge tube to slightly stretch it. This would have been done with a pair of swedging pliers<<

Usually not for keys mounted on pivot screws. Swedging hinge rods (as opposed to tubes) is done sometimes, but almost never with pliers. The only exception is sometimes swedging the tube ends of hinge rods over pilot (straight end) pivot screws.

Shoving teflon into the ends is IMO only worth it as a band aid to prevent noise and usually not even for that. This is not good as a solid and reliable fit (e.g. put so much much that it slightly binds... then play for a while and it's loose again). Once compressed it is pretty noisy, so I'd rather just use grease or very thick oil instead until it can really be repaired.

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bending a post new

Philip Caron

2016-10-21 01:59