Working on the SD1 front cover, oil pump. Got new gears, relief valve piston and spring. Fitted the new gears, checked fit - ~.0035" proud, book says 2.8 to 5.8 thou, so in there. Fitted new gasket, snugged up the bolts, shaft turns nicely, so that is all good.
Rebuilding a dizzy, I found one of the vac advance unit fixing screws is a self tapper. Not going back in. The other one measures as 1/8" dia, 40 tpi...commonly referred to as 5-40 UNC. Cant seem to find any in my modelling kit, so might have to buy some and shorten to suit.