Adjusting Sota Reflex Clamp


I have a Sota Reflex Clamp that won't stay in the down position when placed on the record. I know these are adjustable. Does anybody know how to adjust a Reflex Clamp?
muzcal
Try this Audiogon link:

http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&990539860&openusid&zzJrook&4&5
turn it upside down. Inside the center hole is a screw. Use a flathead screwdriver and GENTLY turn it a little clockwise or counterclockwise.
I've taken these apart and really haven't seen any parts that wear out. Just the screw adjustment.
When I use mine, I do push down on the entire clamp when closing the clamp.
I have the one with the plastic hex screw inside the center hole.And it has a metal piece that spins when you try to adjust the screw. What's the best way to deal with this type?