Dale,
Yes its for rc boats, some of the club members have square drive fittings, but most of us do prefer collet types. However, sometimes one or two square drives vanish into the pond so I was looking for a way to make them as it will be cheaper than buying retail.
If I am successful making a square drive I think we will be looking to buy a length of shaft to cut and make our own as needed.
If you know of a supplier in the uk for lengths of cable I would appreciate it.
Thanks
Ian