Interesting the putting together bit Clive, I remember seeing some were on the net, assembly instructions for the F 28.
No you don’t see F300s now or the F28s, One problem with older Hondas you can’t get parts to keep them running, so a lot will be scraped. I see on a parts list the shaft you mentioned is marked obsolete, mind you the price was still on it £98 00 so that would make anyone think if it’s worth doing. I see there’s quite a few parts still evaluable for the G150 engine apart from an exhaust, but that shouldn’t be to much of a problem. Is yours the earlier 2 speed or the model F400 that’s got two speed and reverse. When I used the F28 I was surprised what power the 67cc engine had. This G 150 is 144cc / 3.5 hp must up to the gob, I hope to find out.