Agreed, an 1/8" pin is too small for my comfort zone. If we're to adhere to the 1/3 diameter as the rule of thumb, that still only permits a ~ 4mm pin. Maybe make that lever arm wider and use 2 x 4mm pins - one on each side?
I'd seriously consider just welding it on. With the inclusion of a couple of grease nipples, it'll last another 50 years.
Anyone know who did the drawing?
Hang on . . the drawing calls out a 1/2" inner shaft??
Is that as per stock on the TCS? I ask because my S2 uses a 3/4" OD hollow shaft.