Author: Gordon (NZ)
Date: 2005-12-04 02:47
For play in pivot TUBES, a valid alternative to fitting larger shafts, often used by technicians, is to 'swedge' (industry term - not in the dictionary) the tubes. One uses specialised swedging tools to squeeze the tube tighter around the shaft. In the process, the tube gets a little longer (depending somewhat on the particular tool used, and may well need follow-up adjustment for length, for which other specialised tools are used.
This is not possible on a tube which has attachments brazed all along its length, as is often the case for F/C & G#/D#.
Swedging can also be used to lengthen keys that have point pivot screws at the end, in order to remove play.
In my experience, sloppy pivot tubes are normally like that because they were MADE like that, rather than from wear. It is a very easy way to skimp on manufacturing costs.
Some swedging tools are like pliers with a smooth pair of half-rounds cut into the jaws. Another is a collet-type, which squeezes more evenly around the metal, but can only be used on an open end of a tube.
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