These keel guides were poorly designed on this Magic-Tilt trailer supplied for this Com-Pac 19. In order to launch and retrieve the boat, the trailer must be so deep in the water that the support bunks must be almost completely submerged, therefore these guides are well under the depth of the keel when the boat is winched up. As I pulled the trailer out, the boat dropped down wherever it happened to be, depending on how the draft of the water pulled it. This last time, it fell on the left guide, smashing the supports and breaking the rear one at the roller shaft hole. This was the third time one side or the other has been smashed.
I decided they needed to be raised to a height that the boat cannot sit on them again, a height sufficient enough to actually allow the boards to guide the keel in as they were meant, but not designed, to do. Here is some flat bar stainless steel that I bought as scrap, and then had the machine shop where I got it bend a 90 degree angle and punch 4 holes in each. He charged me $12 for the steel and the work!
Here the new supports are in place. As you can see, I mistakenly told the guy at the shop that the trailer's crossmembers were 4" thick, instead of 3", so the bottom hole had to be redrilled to fit, ruining the nice custom finished look I would have had from the machinist's work. I had to take them to a local welder to have the new holes drilled because my drill or bits, or both were not capable of putting a dent in the stainless. He charged me another $10 to drill 4 holes.
Here the guides are back in place, secure by 3/8" round head carriage bolts through the entire 2x4s and countersunk into the carpet. I had used 3/8" wood screws previously, but with all the abuse they were taking, they kept working out. The carriage bolts ain't moving.
Next step: Figure out how to raise the boat high enough to replace the rollers with a 2x12.