Replacement cap for Park Tools DP-2 dummy pedal

thingiverse

**Update - 20 Sep 2019:** I uploaded a v3 version with even longer threads and a nice taper for when your coworkers in the shop keep stripping out the v2 version with shorter threads. Unfortunately, I can't upload a version to make coworkers less hamfisted. **Update - 10 Nov 2018:** I uploaded a v2 version with longer threads for when your hamfisted coworkers in the shop keep stripping out the original version with shorter threads. Park Tool's DP-2 dummy pedal tool is a simple tool that threads into the 9/16-20 threads on a bicycle crank, allowing you to turn the drivetrain when a bike doesn't have pedals installed. The head is plastic, and a hamfisted mechanic can easily strip the threads, especially since there are only a couple of threads. If the cap gets stripped out, the tool becomes worthless. According to the tool's instructions PDF, it looks like you can order part #898 as a replacement, but since it's such a simple part, you could just print up as many replacements as you need. This thing is just that replacement, modeled to directly replace the #898 head of the DP-2. The threads are 5/16"-18tpi (not sure why Park uses SAE threads here, as bikes are predominantly metric), and the nylock nut is 1/2", but a 13mm cone wrench works well. Hold the nylock nut with a cone wrench, and the cap will thread off, although you may find it easier to hold the cap in a vise or with channel-lock pliers as it fits pretty tightly. The original part has a cutout in the back into which the nylock nut fits, but I don't see much in the way of functional improvement in that. Removing the cutout makes it easier to access the nylock nut with a conventional open-end wrench and allows the thing to be printed without supports. I also have a complete redesign of the PD-2, optimized for printing on FDM printers, available here: Dummy pedal for bicycle maintenance - redesign for FDM printers