Spacer, Spindle, C3 Mini Mill

The keyway lines up perfectly with the shaft, and the 17.5 mm length sits flush without any wobble. I was worried about plastic holding up, but it's snug and does the job exactly as described.

Honestly, the spacer's fit surprised me—the 30.2 mm ID slid onto the shaft without any wrestling, and the 5 mm keyway engaged cleanly. The plastic feels durable enough for the job, and at 17.5 mm long, it sets the spacing exactly where I needed it.

The plastic spacer slid onto my 7x14 mini lathe's spindle shaft perfectly, and the 5 mm keyway lined up without any filing. Just what I needed to eliminate that annoying wobble.