Hello Ron,
The W._ at B_ (mailto:W. at B) . 90% action was presented as
a "Grand" action in a small vertical in the late 1940s.
I think the ones we had then was the Shoninger
brand.
We found that the action regulation was not reliable.
The best remedy we found was to reduce the hammer
blow a little and or increase the key dip a little.
In extreme cases when checking was the problem
we would use back check leather on the hammer
tails.
Most of the 90% actions will be found _Story at Clarks_ (mailto:Story at Clarks)
and Everetts.
Richard Bittner has more experience with these
actions than anyone I know.
Jack Wyatt
Dallas
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