The Little Screw & Washer under the Base that stops the Primer Punch from dropping down to far below the
#12U* Steel Floor Base,
Description is as follows::
SCREW Slotted Fillister = 6-32 x 6/32"
WASHERDiameter = .375 OD
Hole = 3/8"
Thickness = .038 varies
"Now You Know Said GI Joe"