The upper rotor mount broke off.

I screwed the rack mount to the spindle using
the extra screw I ordered. I removed the upper dishrack's front stops and slid the rack
out. I clamped the mount to the dishrack. I screwed the rotor to the spindle with the screw that came with the rotor kit. I slipped the feed tube mount over the end of the tube and clamped it on the dishrack. I replaced the rack in the slides and replaced the front stops.

I had a hard time driving the screws. The slots are crossed but do not seem to be standard Phillips. The screws were hard to drive into the holes in the hard plastic. Before I could drive the mount screw all the way, the slot was too stripped to use.