HP P3005 Thrust Stopper p/n RC2-0657-000

The HP P3005 laserjet printer is a workhorse. However, after many pages it may become necessary to replace the fuser drive gears, about a $15 fix. One of the gears is retained by a little clip HP calls the "thrust stopper." The gear replacement instructions warn you not to drop the clip inside the printer...

Not willing to spend $10 for a tiny piece of plastic nor wait weeks for shipping from China, I designed a replacement. This part has many inscrutable features. What do they do? Ar