Replacement cap for Park Tools DP-2 dummy pedal

Now available for purchase on my Etsy store.

Replaces the head on a Park Tool DP-2 dummy pedal.

Update - 20 Sep 2019: I uploaded a v3 version with even longer threads with a nice taper for when your hamfisted coworkers in the shop keep stripping out the v2 version with the shorter threads. ಠ_ಠ 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 the shorter threads. ಠ_ಠ

Park Tool's DP-2 dummy pedal tool is a simple tool that threads into the 9/16-20 threads on a bicycle crank so you can turn the drivetrain when a bike doesn't have pedals installed. The head is plastic, and a hamfisted mechanic(which wasn't me, honest) can easily strip the threads, especially since there's only a couple threads. (This makes it easier/quicker to attach the tool, you don't have to thread it all the way into the cranks)

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 which is optimized for printing on FDM printers here: Dummy pedal for bicycle maintenance - redesign for FDM printers

Print instructions

Shells are your friend here, and if you use enough shells, you don't need to go heavy on the infill. I use at least 4 shells. Layer height is up to you but I have excellent results with 0.2mm. 0.3mm might get a little messy and not thread in well. You could go finer than 0.2mm but at that point you're just taking longer to get similar results.