You can urethanize them yourself!
Go to the local Home Depot type place and buy a tube of polyurethane for a cualk gun and fill the air spaces in the mounts with the stuff...allow 2 days for it to cure. I did it and it works great.
You probably saw my post about this from about a month ago:
http://www.mx6.com/mx6_board.html/showthread.php3?threadid=1034
Go to the local Home Depot type place and buy a tube of polyurethane for a cualk gun and fill the air spaces in the mounts with the stuff...allow 2 days for it to cure. I did it and it works great.
You probably saw my post about this from about a month ago:
http://www.mx6.com/mx6_board.html/showthread.php3?threadid=1034