Timing Gear Cover question

[Conaway2]

What is the spec for the depth of the timing spring and plunger well ? And, is this constant over all years of model A production ?

The engine in my roadster - rebuilt as a short block by Schwalms 6300 miles ago. -has a timing gear knock. The knock disappears completely if I push against the timing gear with the timing pin.

I have replaced the timing gear several times, and also replaced the timing gear plunger and spring. But, the tension from the spring as i reinstall the timing gear cover seems less on this engine than on others I’ve owned. Did the depth of the longer well on the timing gear cover change over the years of production ?

Or, maybe I have a very worn timing gear cover.

Thanks very much,
Jim