Jack, I mounted my tri-ducer directly to the transom on our maritime. no problem. Take you time, measure carefully. I drilled the holes and use a c-sink as mentioned to prevent gel-coat cracks. I put some 5200 on the screws(4200 also could be used) and mounted the bracket.There is some play in the bracket for adjustments but it's best to spend an extra few minutes when aligning it before drilling.
The starboard method is simply this:
Cut a piece of starboard to fit the transon area and large enough for the tri-ducer bracket. Mount the starboard to the transom using 4200, so you can remove it later if need be. The trick to get the starboard to stick to the transom, as nothing will stick to the starboard, is use a dovetail bit in a router. Rout a couple grooves in the starboard face that will go up against the hull, doesn't need to be very deep. The 4200 should fill these grooves and also on the face of the gelcoat. This helps prevent the starboard from tearing off. Check with Paul D. on this method as he's a big proponent of it.
I'm afraid that if it pulls off at speed things will be flying hard and fast.
__________________ Smoke free 8+ Months!
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