Re: Outrigger Install on Grady 232 Hardtop Weld or Backer Pl
I agree that welding would be best, but I've had my riggers mounted with backing plates on my current boat (330 Express) and my previous (Boston Whaler 28 Counquest). The bases were installed by a previous owner on my 330 several years ago, and there's no sign of any problem -- the top is rock solid (my surveyor tapped it thoroughly, and there are zero signs of cracking or movement). I installed the riggers on my whaler myself (Taco GS270s), and that boat also had a cored top. As Fishtales mentioned, if you go that route you should use the tube spacers like Taco recommends.
I run 18' Lee's Carbon Fiber telescoping poles, and I basically never retract them even when running in rougher seas. I do keep the halyards tensioned back to the hard top tubes to minimize upward flexing...
I'd definitely recommend Carbon Fiber for the rigger poles -- they've gotten a LOT cheaper and they are MUCH lighter and stronger than aluminum. That will certainly help reduce stress when underway. Or you can be less lazy than I and retract the poles if they are telescoping! I could be wrong, but I've always assumed that the stress on the bases when running (with poles extended) is a lot more than the stress when actually fishing. Even when pulling heavy bars (I usually drag 4 splash bars from my poles), the pull is pretty constant and presumably exerting less peak force (torque) on the bases.
Hope this helps and enjoy your new riggers whichever way you go. They make a HUGE difference in presenting the spread in my opinion!