RWD3M
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https://www.mig-welding.co.uk/forum/threads/cheap-chucks-and-d1-4-backplates.99967/.
I’m currently awaiting a back plate. So cant tell you about accuracy or repetition.
Plenty available between 75mm-250mm.
Its to replace a PB with worn jaws, the chuck and backplate cost less than a new set of PB jaws
This one came from a Polish seller (not) with free return postage.
So the back plate is sort of independent from the chuck then. I see mine has 3 nuts securing it that I hadn't noticed before.
Thanks.