Hey!
Thanks for your comment. I take it as a compliment. Yeah! mine is a little similar I suppose but Clickspring's version has a more elaborate shaped clamping finger, a "V" slot at the back rather than my "U" slot and he incorporates drill guide bushings. I did study his (and others) before settling on my own design. My version also has a small clamping slot on each side which I don't see in his. Clickspring makes really nice stuff though and makes fantastically clear videos. I often log onto his site; really cool.
Thanks again for your interest.
Brendon