Knuckle type

[Horace Greeley]

Paul,

Quoting "Paul Chick (Earthlink)" <tune4@earthlink.net>:

> Can you post a picture of your picture of "the correct jack
> alignment..."

Actually, the picture Barbara provided is pretty close...if you bring the 
jack sufficiently far "forward" (toward the keys) so that the back edge of 
the jack lines up with the perpendicular part of the shank (inside the 
knuckle), the jack will probably escape too soon for much control and/or 
power.  If you align it such that the front edge of the jack aligns with 
the same point, it appears (from this picture) that the back edge of the 
jack will be pretty close to the back edge of the yoke/window in the 
repetition lever...and the action will fell pretty "clunky".  

While I do hope Joe is able to push out the "correct" specifications, with 
an action of this age and condition, having something which works reliably 
and predictably is going to be of more value than precise attention to 
published details.

In Thayer actions, the knuckles wear differently than they do in other 
designs; and they (the knuckles) do not respond as well to 
traditional "reshaping" techniques.  The picture demonstrates this pretty 
well. 

Also, check the spacing shim located between the whippen rail and the 
action bracket; and, while doing that, check the alignment between the drop 
screw and the "bumper" felt on the top of the repetition lever.  I suspect 
that someone, presumably at the factory, from the looks of things, had to 
think about spread issues to get the alignment of the jack and knuckle to 
be as good as it appears here.

Best.

Horace