Nothing special, these lift the aft supports for the hardtop frame so taller crew members don't bonk their head. Needed a slight angle on one face to sit flush. Originally these were going to be teak (turned out I didn't have enough) and weather conspired to prevent bottom paint removal so spent better part of half a day on these. Goodly amount of that figuring out what angle and how I'm going to hold the part. I've never machined an angle. Eventually I punted...aligned the 3 jaw on the rotary table so one jaw was perpendicular to the bolt holes and put a shim on that jaw, and carefully nibbled away with a flycutter till it finally cut all the way across.