1970s MKS bike pedal dust cap (internal thread)

Replacement dust cap for old 1970s (and earlier) Japanese MKS bike pedals, with internal / female M23x1.0 thread.

Newer MKS pedals have caps with external / male threads.

I printed it thread-side down (better results with the tapering), no supports were needed.

Installation can be tricky.
It helps to soften the inner edge (where the thread starts) with a deburring tool or sand paper.

Depending on the printer, small adjustments might be needed for a good fit. To do that, slightly scale (a few %) in X and Y (keeping the height as-is).

I also made a version with the hex nut, more close to the original, but abandoned it during fine tuning. Let me know in comments if intrerested in that version.