I recieved a rod yesterday, Delrin, for bushings. My wife is happy with me as I am

Coming to these using a stainless steel sleeve model 16x2mm.
This is what it would look like, as common.
Then today I got to work hard because I do not have access to laser-cutter. Began to mill as deep as I dared, without them to come off, and the plate begins to vibrate and break the cutter. Then there has been much handwork! Good for me, to practice a bit. Continued on these!