Following Slow Arrow's lead, I modified an existing pulley so that it would allow a "rope" (string) start. Video below shows just how this looks and works for anyone contemplating doing the same. Pulley needed requires an 8 mm bore to fit the shaft on side opposite the governor weights.
It seems the perfect way to easily start either the M91 or even the M90 which is generally easier to start anyhow, but the string makes it a little more fun!!!
Rog