I had a student dislocate their shoulder so I created these brackets to fit onto a boom style cymbal stand so he could still play with his good arm. Worked really well. He used it with a yamaha advantage trombone. I used 1/4"x20 x 1" bolts with nylock burs. I printed this in PETG using 5 walls and 40% infill. I did print with a brim and tree supports.