[Source] Looking for these

I forget the name of them but the only time I have noticed those for sale were on ebay from China.

If you can't find any here's an idea. My mill/drill came with those for the gib locks. I wanted better ones so I went with the adjustable postion levers mentioned above. But for the thread size I needed the handles were way to long. So I purchased the handle size that I wanted with a female thread & rethreaded studs to fit the handles.

Plus 1 on the Kipp handles. I have a Kipp on my lathe for the carriage lock. These black ones I got from Mcmaster & are nice too. I wanted to use one on my compound slide also but on my lathe with this type of handle it would interfere with my compound screws since they are not recessed.

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The quest for these screws came up some time ago on this forum. As I recall, it was unsuccessful then. The HM search function isn't working for me at the moment.
 
My lathe had regular set screws which I replaced with DIY knurled thumb (?) screws. I took an ordinary internal hex cap screw and pressed a knurled aluminum donut over the head. They take up a minimum of space and when extra torque is required a hex key can be used.
But I wonder how much pressure should we put on the side of the gib and what shape should the screw tip have?
 
I had a Delta drill press that had one of those screws on the quill depth stop. It is Delta part #1311037. This is a link to a parts supplier that has it in stock. They don't give the screw size, but maybe you can call them and ask - maybe even ask them who they buy it from.

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I use a bicycle saddle cam lock. I think its M6, I will check later
 
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