Nut of low model.
Number 1 in the exploded view,
Corresponds to Sachs original number 29045-212
Fits in LS, LFS, KFS, BKFS, KS etc. in various places. E.g. as a drive nut on some, crankshaft nut on others. Check the exploded drawings for your engine!
Also fits as a drive nut Zundapp 3vxl and on Husqvarna Flinta 3 vxl foot .
Husqvarna 2 vxl foot has M10x1. Hand geared has M14x1