Xpider vs Tourna fixed tennis clamps

The Xpider and Tourna fixed clamps look almost identical. Are there any differences? Which are made better? Do they both live on 12mm post? Thanks.
 

Irvin

Talk Tennis Guru
Do you know of any other good clamps that have 12mm posts?
I know the Tourna clamps are 12 mm because I measured them. Don't know what other clamps have 12 mm posts. I think I seen a video showing how to put Xpider bases on a Gamma machine so I assume the Gamma clamps are 12 mm.
 
I know the Tourna clamps are 12 mm because I measured them. Don't know what other clamps have 12 mm posts. I think I seen a video showing how to put Xpider bases on a Gamma machine so I assume the Gamma clamps are 12 mm.
I have an Alpha Apex, so the 12mm should fit. I've never cared for the Alpha clamps except some of the older ones that Mark Gonzales found and shipped to me.
 
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