Dimensions of Mannlicher Schoenauer (Schönauer) Take Down Pin:
(From pin of 1922 proofed M1910)

Inch --- Millimeter --- # - Description
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1.312 --- 33.32 --- 01) Overall Length

0.073 --- 01.86 --- 02) Thickness of head*

0.079 --- 02.00 --- 03) Head to Flange

0.032 --- 00.82 --- 04) Flange Thickness

0.187 --- 04.75 --- 05) Top of Head to Bottom of Flange

1.063 --- 27.00 --- 06) Flange to Radius at Bottom of Pin

0.445 --- 11.30 --- 07) Diameter of Head

0.251 --- 06.38 --- 08) Diameter of Flange

0.185 --- 04.70 --- 09) Diameter at Inside of Radius Between Head and Flange

Diameter of Pin:
0.197 --- 05.00 --- 10) At Flange

0.179 --- 04.54 --- 11) At 13.5mm Below Flange (mid-point to bottom radius)

0.165 --- 04.20 --- 12) At Start of Radius at Bottom of Pin

0.850 --- 21.60 --- 13) Center of Spring Pin to Flange

0.874 --- 22.20 --- 14) Bottom of Cut for Spring (to flange)

0.064 --- 01.62 --- 15) Thickness of Spring

0.065 --- 01.64 --- 16) Width of Slot for Spring

0.106 --- 02.70 --- 17) Notch in Spring (Catch)

0.221 --- 05.62 --- 18) Width of 'Push Pin' Face (Knurled)

0.092 --- 02.34 --- 19) Thickness of #18 at center (ends taper upward in a 'moon' shape)

*02) Underside of Head of Pin tapers downward toward center - thickness measured at edge where knurl begins. This is why #s 2+3+4 = less than #5

The plates mounted to the stock have holes of the following size for the pin to pass through (from right to left); Right Side - 5mm Left Side - 4.4mm .

Photographed from underside (right is left).
The distance between the outside faces of the escutcheon plates (at the pin holes) on this 1922 proofed M1910 Takedown is one inch (25.4 mm).

Ol' Grand Dad with the M1910 Takedown.