regulating jack to knuckle alignment

[Ed Sutton]

Yo Newton,

This is great!
I have never been able to see what is going on in the middle of all those
jacks and levers.  It always leaves me with a backache and a bad mood.
Doing it your way, I made three quick passes, just fixing the obvious odd
jacks on each pass.  It was remarkable how sensitive my touch was by the
third pass.
10 minutes; no bad back; no bad mood.

Ed S.

Newton Hunt wrote:

> As to jacks to knuckles, the basic criteria is how much the jack rubs on the
> knuckle when it is being tripped out by let off.
>
> If you lightly rest a finger upon the shank and use a thumb to move the jack
> toe
> out from under the knuckle (or not knuckle) you can actually feel the amount
> of
> rub there is which is a VERY accurate measure of jack location and
> engagement
> which accommodates different knuckle sizes and locations and will,
> ultimately
> give you a better touch.