Thanks Norm,
Very helpful. I had never heard of a Super 24 until I joined this forum.
The base looks like its designed with a Briggs in mind. It has the centre slot about 50 or 60mm wide and then two long slots about 12mm wide running lengthways on the outside. I'm not even sure I would need the sliding plate, a PT might nearly go straight on. Plenty of Powertorques around here but not many full cranks. Unfortunately I might have to pay these days rather then picking up from the footpath.
The current boss seems to work. Looks like my pulley must be aftermarket the original is probably still on the original motor. No hydraulic puller probably. I'll get my old mate with a lathe to turn down a boss so it fits a bit neater.
Thanks again for usual expert assistance.
All the best
Jeff