Radius Turner

It is cool, I like the simplicity and smooth design of the slide. That is now on my project list for once the weather warms up a tad.
 
Neat design. A couple questions:
- how do you lock the top slider block into position? I don't really see any side grub screws or vertical clamping (I see a rectangular slot under the angle dovetail part, maybe that's related to above? )
- can you elaborate on what you used for a pivot shaft & maybe bushing or bearing?
- what kind of insert are you using? (would like to see a detail shot of the L tool, how you milled the pocket etc. if you have a sec one day)
- is there anything that can tweak the insert tool center height up or down slightly, or built to this datum & stays this way?
 
I have a question about this design and radius turners in general. It seems that your stock has to stick out pretty far to avoid interference between the chuck and the platform. Do you have problems with chatter due to this? Is there a design that minimizes this issue?
R
 
I've seen some over the top radius turners that would avoid that problem. They're a lot less common than the swivel around the compound though.
 
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