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ONLY TURN THE SHOULDER OF THE BACKING PLATE WHEN ATTACHED TO THE LATHE SPINDLE. When turning the shoulder of the backing plate. You would not need to drill any mounting holes but you will need to turn the shoulder down.040" to match the back of the lathe chuck to make the chuck& back plate more concentric with the lathe spindle. Because the gap between back plate and chuck is smaller.
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The size of back plates's D1 should be a little bit smaller than the size of Chuck's D1. Please measure the size of Chuck's D1 before process your back plates. The fully-machined back plate can be mounted onto 5" 3 jaw or 4 jaw self centering and independent lathe chuck(p/n 202-5594) All back plates have 0.04" allowance. more The semi-machined back plate has to be processed into fully-machined which is showed in the above fig before they can be mounted. SO PLEASE, IF YOU ARE ONE OF THESE PEOPLE, DO NOT BID. THERE SEEMS TO BE SOME BUYERS THAT TRY TO SHAVE MONEY OFF OR CLAIM THINGS THAT ARE NOT TRUE. I WILL, HOWEVER, NOT BE BULLIED OR BLACKMAILED. I ANSWER ALL EMAILS AND WILL TRY TO WORK WITH YOU AS BEST I CAN. IF THERE IS A PROBLEM WITH YOUR PURCHASE, OR ANY OTHER QUESTIONS, PLEASE, DO NOT HESITATE TO EMAIL ME. PLEASE KNOW THAT I TRY TO SATISFY ANY AND ALL OF MY CUSTOMERS. Please email me for combined shipping rates. Sold"AS IS" with NO REFUNDS OR RETURNS! NO EXCEPTIONS. if there are any questions, please do not hesitate to email me with any questions.PLEASE SEE THE PHOTOS FOR THE BEST DESCRIPTION. I tried to take photos of the parts that came with it. Please see my other auctions for more tools items from a local estate. The pictures show all that is included and the condition so please look close. I do not know much about these so I am selling it AS IS with no returns. more UNTIL I SEND THE INVOICE AT THE END OF THE SALE. THE EBAY SHIPPING CALCULATOR MIGHT BE WRONG, PLEASE WAIT. PLEASE SEE MY OTHER AUCTIONS FOR A LARGE SELECTION MACHINIST ITEMS.