A little more follow up. For those of you with the JSP adjustable, did you buy one end or both end adjustable? What is the difference? If just one end, does the gap size differ across the length of the rollers? I guess I'm confused with the difference. I think the JSP is the one for me, after having used one in a LHBS recently, have used a MM 3 roller at other LHBS, just think that is overkill for what I am currently doing.