@ Veggie
Thanks for re-posting with the links.
IMHO, this is the best add-on starter system for a Listeroid. After 6 years of use (we're off-grid) it still works without problems. I estimate around 1500-1700 operating hours and around 1000 start/charge cycles. Keeps the starter battery charged so there is a independent lighting system in the engine area too. Does not use a noticeably high current draw for starting.......I originally installed a well used (scrapped) car battery and it is still in service after all these years. Also the starter/generator does not use an appreciable amount of HP when in charge mode. In fact, though there is additional power used, we can't see/hear any difference without measuring.
We had previously installed a friction starter, but had problems when there was an ice film on the flywheel from the freezing fog that we get here sometimes. The friction starter is still in place, but hasn't been used for years. That's also a simple system, though required a bit of machining to adapt the starter motor.
Golf cart starter/generator is the way........no machining, no welding. Hacksaw, file, drill motor was all that was required. We just fabricated a bracket from Aluminium channel and bolted it up.
Thanks again Veggie, for getting us started.
Cheers
Hugh