ya i have used a color blem, 6 inch pin blem, high top weight blem. The color blem was fine, the 6 inch pin i put the pin way above my bridge and cg in my palm, this was a pretty snappy ball, and the high top weight one i just drilled the fingers deeper and put a large weighthole in, no biggie. I think all three of these blems are ok as long as you dont get too long of a pin or too high of a top weight. I'm not sure on other types of blems though.
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stanski