MJ...here's a shot of the bow...basicly just removed the center section of the factory rail(the piece I sent you came from cutout)...left 1/4" or so past support, went to hardware store and found "inside" tubing plugs... ;D...
This bow-light setup has worked out great...just flip the switch...nothing to store or install when needed...I like the permanent mount and the 3/4" Starboard gets the fixture at just the right height.... :)...
Are you thinkin' of splittin' the bow rail for easier anchor rope access?...W/ your new pulpit roller, seems you won't even have to get on the bow-deck to hoist the rope...rope oughtta work under rail...but I'm not there; you are... ;D...