Bike Helmet Mirror Ball Joint

Replacement ball joint for Schwinn (and other no-name brand) bicycle helmet mirrors.
Works well despite slight deformation of ball during printing. Ridges don't grip quite as well as original but do a respectable job.

Update: After printing several of these I found that the ball didn't print consistently enough to fit well in mirror arm. I've added files with the piece split into two. With the split parts I find no raft is needed and minimal supports in the hole of the larger piece, and sinc