Cease & Desist - New featherweight

[Theo]

Thanks so much, I found some reverse thread chuck screws on eBay too for about a fiver. The motors I bought seem to be a pair of B&Q drills, a wickes one and another unknown make, two of the chuck screws matched so the missing one must be a different type. they ranged from 22mm (one) to 16mm (pair), I'm going to play safe and get a 20mm screw to be on the safe side while not being too big. I don't suppose you have any useful measurements of yours for reference? These are the only motors I've ever bought so I don't really know the average size of the screws. Thanks anyways for the link to the grub screws, I'm going to place an order tomorrow, thanks.