Glue Joints, jacks

[Newton Hunt]

This joint, like many others, is a problem because of the different
rates of expansion and shrinking of wood grains glued togather at 90
degrees to each other.

The jack flange expands and contracts much more than the wippen rocker.
Hide glue is a less than satisfactory glue because of its brittleness as
it ages.  Wurlitzer finally fixed this problem by putting the bushings
in a jack and the bird's eye on the rocker as a hump left after the
rocker was machined.

Only way to solved this problem is to reglue the joints with a more
flexable glue or to allow CA glue to wick into the joint without taking
it apart first.

One was suggested is to unhook the bridle straps, remove the wippen
screws and let the wippens hang on stickers of remove them entirely and
test each joint well and reglue those that come apart and replace the
wippens.  Done wholesale speeds the job.

	dNewton
	nhunt@jagat.com