I decided to build a model rocket but needed a way to attach the fins correctly. I opted for making an alignment jig that would keep the fins equidistant from the body. There are 2, 3 4 and 5 fin versions. The center peg is 10mm in diameter and 60mm in height. I made a sleeve to fit over that which is the Cherokee version. The sleeve is 11mm inside diameter and 62mm in height. The diameter of that sleeve is 31.5mm to match the inside rocket tube diameter. Other sleeves can be made as long as they are 11mm inside diameter to fit the peg. This was printed in PLA with 30% infill.