I realized that I THOUGHT I understood it all, but apparently I don't. Can some explain the various terms to me: spring-assisted, cone lock, swivel, etc...? Swivel I'm pretty sure I get (as opposed to glide bar). What is cone lock? If your base clamps are cone lock does that imply they are NOT spring assisted? I emailed Mutual Power asking if my machine could be upgraded to spring-assisted base clamps, and the reply was that they ARE spring assisted. Maybe I am a complete idiot and using them wrong (entirely possible!) The MP web site says: // I get this part Adjustable width linear ball bearing string gripper. // I get this part 2 diamond-coated spring assisted aluminum alloy thumb-adjustable swivel tennis clamps. // I don't get this part Easy operate cone lock swivel clamping system with durable carbon-steel handle. I thought that if it was cone lock, it was NOT spring assisted? My understanding is screwed up.