Recently bought a 14 ft topper john from bass pro and struggled with various rod holders that would securely mount to the 1 1/4 inch round rail of the john. Spent too much money on 2 drift master holders and the screw on type bracket to mount them ( the mounting brackets wouldnt hold them tite enough ) . I work for a trucking company in the shop office and one day I happened to look up at the mirror braket on a drivers door and low and behold -- there was just what I needed. Its a aluminum universal CB antenae mounting bracket that clamps to round mirror bracket on a big truck !! Didnt have to change a thing so I just drilled 2 holes under the boat rail and tightened it down. Put the driftmaster thru the hole and put a washer and nut on under neath side and used wing nut on top and tightened. Talk about solid -- these things are really on there and dont give a bit. You can get these mirror mount CB antanea brackets just about any where that sells CB radio's including truck stops. Hope this helps some of you with the same dilema I had.