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Originally written: circa 1990
Last updated: June 13, 2009
The following is an excerpt of a chart I received from Popular Science. I found it invaluable during the restoration of my Morgan and thought I'd pass it along.
Screw Body Machine Wood Soft Hard
Number Screws Screws Wood Wood
4 #31 1/8" 1/16" 5/64"
5 #29 9/64" 5/64" 3/32"
6 #27 9/64" 5/64" 3/32"
7 ---- 5/32" 3/32" 7/64"
8 #18 11/64" 3/32" 7/64"
9 ---- 3/16" 7/64" 1/8"
10 #9 3/16" 7/64" 1/8"
12 #2 7/32" 1/8" 5/32"