Bass clarinet floor peg tightener

I'm calling this a “shim washer” for the floor peg knob of a Jupiter JBC-1000 bass clarinet. My son complained about not being able to tighten the floor stand peg of his bass clarinet. Though it had never tightened well, it finally got so bad it would slip down every time he played. So annoying! 

On inspection, I found the knob was bottoming out on the screw threads before it could place enough tension across the peg. I modeled up this small print to press-fit onto the knob, take up the extra slack, and let him tighten down on the peg really well so the clarinet doesn't slide down. Because it fits the knob snugly, it won't go missing the first time the knob gets completely removed.  

I printed this in PETG on my Bambu Lab X1C at 0.16 mm layer height (probably overkill) with 4 perimeters, 6 bottom layers, 6 top layers, and 50% cubic infill. 

For correct tolerancing, I suggest printing it as-provided, and at 98, 99, 101, and 102% scale in x and y axes (leave the z axis at 100%). The ideal fit won't quite bottom out when pressed on by hand, but will seat completely the first time it's tightened.