Thought I'd detail the fix that we did to our trailer so that others have an easier time than we did.Boat: 2014 SN200, trailer 2016 Boatmate single axle
Background:When we purchased the boat it was evident that the front strakes were rubbing on the trailer. Searching around, including on this forum, there was a fix from Boatmate that included shimming the bunks and installing a roller infront of the fins. When we contacted our dealer who inturn contacted Boatmate, although they had installed this fix on other customers, they would not do anything for us and we couldn't even buy the parts from them to install it ourselves.See the other threads for more info:https://ballofspray.com/forum#/discussion/10455/trouble-getting-sn-200-on-trailerhttps://ballofspray.com/forum#/discussion/26254/ski-200-and-boatmate-trailers/p1https://ballofspray.com/forum#/discussion/21306/boat-mate-trailer-problems-ski-nautique-200-obhttps://ballofspray.com/forum#/discussion/23113/boatmate-trailers
Solution:With the help of @PatM , we designed the fix ourselves. Here's what we did:
Shim the bunks:
we installed 3/4" UHMW shims (3"X3") between the bunks and their supports for each bunk supports except the very front supports. A total of 12 shims are required
Our bunks were lagged in so we had to buy new 3/8" X 2.5" SS lag bolts. I was worried about the extra 1/4" of length into the bunk so we ground off 1/4" from the tip of the lag bolt. A total of 24 new lag bolts are required as there are 2 per shim
we match drilled the UHMW with a 3/8" dia drill and then drilled the holes to 1/2" off the trailer
Roller:
Attaching a roller to the trailer cross member wouldn't work for us as the fins come past the second cross member so we needed to make an adjustable frame for the roller as per the pictures in some of the other threads
to measure, we loaded the boat onto the trailer all the way up with the shims installed. We measured the distance from the front cross member to the fins which was 39" I believe. For height we ran a string line on the top of the 1st and 2nd cross member. The distance from the string to the keel at the location of the roller was 5.25"
We then reverse engineered the roller bracket from the pictures. I've included the fabrication drawings in the attachment. All you need to do is check the measurements and if they are close you can use this design which has all the parts
the only deviation from the drawing is that we didn't end up using a 5/8" SS bolt to attach the roller. We purchased a roller shaft from Tie Down. Is zinc plated steel so hopefully it lasts. We got it long (15") and we will just cut it to size.
To install, this weldment just needs to be welded on centerline, flush with the top of the cross members
Our plan is to weld the tube onto the cross members with the boat off the trailer. We will then set the roller as low as it can go. The boat will then be loaded and the roller brought up to the bottom of the keel and nuts tightened. Then, the next time the boat is taken off the trailer, the roller will be raised 1/4" and the nuts tightened well.
Note: Pictures courtesy of others as we have yet to weld this onto the trailer
Thanks again to @PatM and let me know if you have any questions.