Lenco has tab installation instructions here:
http://www.lencomarine.com/Trim%20Tabs% ... allat.html
Note - IMHO, the biggest and MOST important part of the install is where you need to drill into the hull. You want to protect the integrity of the core at all costs. Here's what I do, but note - this easily adds a day (95%+ of it waiting time) to the install, but I prefer to do it right .. and once. Otherwise, tabs can be installed in just a few hours.
I mark everything out, e.g., where any hole will go into the core, then I test fit everything and then remove all of the hardware.
Holes above the waterline: I drill them to size and then wet them out with thinned epoxy (I use that from
www.raka.com , as good or = to West Systems at < 1/2 the price) using a small syringe, taping off the hull so any drips don't hit the gelcoat. I repeat this once an hour or so so each hole gets wetted 3 times. Once set - proceed with your install of above water hardware.
Holes below the waterline: I drill them oversize, at least 1/8" larger than the "body" size and 1/4" deeper than the length of the fastener you will use. I then wet them out per above, each hole 3 times. Once tacky but not set, I then completely fill the hole with epoxy mixed with kittyhair or another glass thickener and I fill the hole. I use a larger one-time syringe and start to fill the hole from the back, going slow, so all air gets forced out.
Once set, proceed with your install, but use a small sharp drill and centerpunch the middle of the epoxy "plug". Drill this plug with a drill size just a hair over the body size of the fastener. Now seal each screw with a sealant (not 3M 5200, though I do use it with other special tricks). The plug will hold the screws in place and protect the core of your transom from water intrusion.
For other tips on drilling through glass and avoiding chips, see the post on "drilling into the cabin" also in the Project forum.
Hope this helps ... and welcome aboard
!
