I think if I can find a bearing small enough on the o.d. I can machine a block from magnesium (Gee, guys, that's all I have in chunks) and put a 14 mm socket in it . I can weld something on the end to mount a starter pulley. I will helicoil 10 x 32 allen heads in the 4 holes to be a bit more substantial. At first I might just use the 3/8" square hole with a battery drill to see if I can live with it. Ya know, there is ratcheting small sprockets that could be mounted on the socket and use a harp bracket with a bike chain and recoil spring like B&S did in 1927 with the FH engine. Then I would have a kick starter. It would come out of engagement in the up position.