Er......... I don't think it turns anything Alan! The outer claws grip the actual turret while the inner one (fixed) is slotted to hold the actual lead screw in place. There is another tool, the key, that's part of the set. Then when the turret is gripped and the lead screw is held in place, the key locks it all up. It was a zillion times better than the tool in the box, but dear o' deary me, it was still marginally better than hopeless. Armourers were encouraged to make the tool and many did during their basic trade training (see drawings in the telescope book....., cheap and a good read too!). But as I explained, most Armourers chose to ignore these monstrosities and, like me, made their own from ideas taken from experienced Armourers that they met along the wayInformation
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