So it finally came. LP Reo Grand, RM2 and RM3. Built and installed dual 8 wrap 1/16 on the RM3. Went to screw it onto the Grand but it won't screw in all the way and won't fire. I thought the RM3 would fit both Grand and LP Grands. Tried the RM2 and it fits nicely. Any suggestions? Guess I won't be able to try it before the night is over. Gotta go to sleep. Now I have to wait till at least tomorrow 