There's a pic of the underside after final assembly in the fitting, scraping sequence.
Cutting slot for degree ring viewing "window".
The bottom of the recesses in the screw holes were pretty good so I didn't have to redo them, if they were bad I would have used a slot drill or end mill to touch em up. The new screws I am fitting are good quality high tensile screws. An alternative would be button head screws. I tightened the screws with a bit of judicious help from a shifting spanner. The screws are good and tight, that's for sure. Before final assembly I put a light coat of general purpose grease on all internal surfaces. It moves and feels really good.
Obviously a close up of the viewing window. It is fairly easy to see the reading on the degree ring with this window but the window could be milled out larger or milled in differently if one wanted a better or easier view.
All assembled up on my lathe as a test for fit, looking good. I used M6x1 "Whizlock" nuts and as the locking serrations under the integral washer aren't desirable in this application I simply ground the underside to get a flat smooth surface, serrations gone. Obviously the tops of the nuts must clear the underside of the compound so it can be rotated.
The bottom nut/plates are home made out of steel, the studs are M6x1 good quality threaded rod. Using a pin punch I punched the little plates near the threaded hole to prevent the studs from screwing out proud. I then primed and Loc-Tited the threaded rods into the plates. I have used this method on my lathe and found it very effective, good cheap T-slot bolts. I can now post the item back to the owner, it should serve well for years.
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