Alpha starting clamps are very good too. I had problems with the Gamma version made a decade ago but don't know if they have improved the "grab" since then. The diamond dust on the Alpha is very reliable in avoiding pull-through on the initial main tensioning. It has eyelets to allow for making an "extender". Just remember...take care of it just like your regular string clamps with a good alcohol scrub regularly.
"When a man is tired of London, he is tired of life"...Samuel Johnson 1777
"When a man is tired of Federer, he is tired of tennis"...stringertom 2014