With a single concave the common error would be for the fins to face inward by -1, -2 degrees or more.
Not sure how a single concave produced your opposite mistake.
Obviously there is some installer input into the outcome. Go figure!
Sorry. By “out” I mean out of alignment. The fins would be pointing inward toward the center with the 0 degree inserts.
I had a board just like this.
I put a bit of thought into it and couldnt come up with anything easy ,obvious or workable.
Best I could get towards 0 degrees cant was to let the fins point inward.
Now if only there was a 2 degree insert!!! Then the problem would essentially be solved.
Pointing the fins outward with the inserts was no problem.
I realize that various box/plug manufacturers mold tabs around the top for alignment purposes but I always fall back on what has worked for me in the past... namely, put a fin in there while you install the box and make sure. I just did a single box today and that's how I did it.
You can eyeball it, measure from each rail to the tip, etc. One trick with sidebites is to measure distance between trailing edges base to base and compare to tip to tip measurement. Typically the difference is about 1 1/4". This method alleviates dealing with concaves, vees and protractors. If you have the fins set in the plugs as you do this, problem solved. The plugs might be tilted or whatever but the fins will end up where you want them.
I posted a request once for people to take these measurements and post results but as I recall, no takers on that.
I had the same challenge - tail concave , quad , proboxes.
I think Robin Mair mentioned somewhere that his way around the problem is to buzz the bottom off the outboard locator lugs.
I just marked em all with a pencil so all looked the same and attacked em carefully with a sanding barrel on the dremel.
Worked perfectly, fins all correct after install.One box ended up slightly below the finished glass on the rail side , but who cares, right ?
I didn’t bother but I spose you could prefit the boxes and fins to check the angles and fine tune, before install.
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Hi Smovlov, Thanks for using ProBox. Yes bottoms of boards have changed in the last few years again. 2 degree inserts will be coming soon. But you can install ProBox in a deep single concave now. Route the same as you would always. It's best to install side boxes with ZERO degree insert for this advance custom install. Snip off, DON"T snap off( this keeps the resin dam wall of the box intact) the out side install tab located in the middle of the box. This will allow you to tilt the box out. Get a dummie fin to act as a guide. Install glass like regular install, then put in the box with the dummie fin. Push the box into the board so that the front and back tabs of the box hits the surface of the board. Now this is the IMPORTANT part, Make sure your inside tabs are restting on the bottom of the board. Then tilt the dummie fin outward till you are in the desired position by using the gauge as shown in the pic, but do not tilt the outside of the box to deep into the routed hole. Another important think to remember is sand the box from side to side and not flat over. This will shape the box into the concave.
Mahalo, Larry
them protractors are nice, but best used with reading glasses or a magnifying glass.