In article , Gunner
writes:

How do I determine the correct stem lenght?

Measure something *known* and trig it out. Simple. For
small deflections it's also almost linear (sine in radins ~~
angle in radins).

.001" shim stock may come to mind .... or a feeler guage.

http://www.longislandindicator.com/dialindicators.html

[
Lufkin never actually manufactured their own instruments. Dial
indicators were made by Federal Gage.

Repairs: not economical
Sales: discontinued
Parts: no longer available
Information: unavailable
]

Try Federal's Site?
http://www.mahrfederal.com/frameset.htm
--
Cliff