I have the Alpha REVO4k and one of the hostels (the silver medal tube that comes off the clamp base, which the clamp post slides down into) has begun to be loose. It has begun to shift or wiggle back and forth so that I was getting more drawback then I like. I did figure out that I could push on the blue clamp base right before clamping and remove most of the play, but finally figured I would call Alpha and see if they had any suggestions. I got a hold of Mark and he immediately offered to send a new clamp base assembly, and even offered to send it Priority Mail! Yes, it is covered under the warrantee, but no mention of send part back and we determine if it is defect. He just took care of the customer ASAP! Alpha has GREAT CUSTOMER SUPPORT!