I have the original Sinclair front rest with a protek owl ear bag but ears don't go up enough and forend is wobbling a little, giving less accurate results. Is there another kind of front bag on the market that would fit this front rest ? OR, any restriction in Benchrest rules for VFS on homemade front rest bag. I was thinking, since my homemade walnut stock has a square forend of 2 1/4" wide by 2" high, maybe I could make a square wooden square U shape rack covered with felt. Does it absolutely have to be a sand bag or any other material would be accepted?