jack hitting h.flange

[Newton Hunt]

The key dip defines how far "up and out" the jack moves.  Be glad you
can lift the wippen further than the key does for that tells you the
jack is not binding against it's stop.

I would suggest you look at the following:

	Jack position re: the knuckle insert.  
	Key dip
	After touch.  Put .050" punchings on top of the front punching and
determine how much key movement there is after the jack has lost contact
with the knuckle.  There should be none.  That .050" is the clearance
needed.  More is not desirable, less than is also not desirable.  Adjust
the dip accordingly.
	Jack stop cushion.  if there is too much movement then replace it with
thicker or glue on a thin piece of name board felt.  Put the glue on the
old felt before applying the new felt.

There are other considerations but likely not applying here.  Action
geometry, jack geometry, key ratios (unless these problems are all on
sharps).

Hope this helps.

		Newton