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Zee,Here's a link to the better Y Axis lock I was mentioning some time back: https://sherline.com/wp-content/uploads/2016/04/tip_028.pdf It works great and would be a great project to test out your new machines.Here's a video about the same thing: [youtube1]https://www.youtube.com/watch?v=hFlbKQmm6Hw[/youtube1]Jim
The hieght of the holder on the qctp depends a lot on which tools you ate using. On mine I added a ali plate under the post to let me put another t nut out the side to prevent twisting with long boring bars. Had the side effect of raising the whole thing, which helped you issue too. Another quick fix is a bit of bar under the tool inside the holder. Too many combos of tool thicknesses and cutter tip positions to have aftermarket add-ons work everywhere.
I used small countersunk screws through the plate up into the base of the qctp, to lock them together.
What did you all do to prevent the tool post from rotating on the plate?Have you got a sketch or drawing of the plate?In your picture, Jim, are you using 3 T-nuts?