If you have the octagonal spinners, the tool from MWS is just the ticket, solid brass, low cost (£14), fits in the tool tray, and can be used with a nylon or hide hammer.
Nigel, Isn't the problem here that what we are dealing with ISN'T the normal octagonal( ie non -eared) spinners When I had these, I used the MWS tool and found it excellent but once I changed to spinners with ears, the MWS became redundant? Cheers. G