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I would like to revisit the question of countersunk Tinnerman washers.
I looked at several posts in the 1999-2000 time frame and I'm still not
sure what I intend to do.  

First off.  There seem to be at least four variations of countersink
Tinnermans. Two diameters of flange type per the illustration in the
current AC Spruce catalog, pg. 96 described as finishing washer type
NAS390 (603).  The type shown as countersink NAS391 (601) and a fourth
type that I got by standing at the counter and comparing types which is
the number mentioned as being shipped by Lancair, NAS390BxP where x is
6, 8 or 10 screw size.  The illustration is NOT of that washer number.
The washer is more like the countersink version except with just a small
amount of roll lip on the top (imagine taking the illustrated
countersink washer and latheing most of the outer diameter off.  At this
point I want to know if there is also just a cone countersink washer
(all of the outer diameter gone)?

Secondly, Jim Frantz, when you made your countersink tool, did you do it
for the flush type of washer?

Thanks,
Charles R. Patton
N360JM
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