Herr's wishing you a happy a prosperous new year.
Got a few more parts made, the swing arms took a little creative thinking I want this engine to be within the capabilities of a Newbie with a modestly equipped shop, the holes in the swing arms need to be symmetrical with them selves and with each other, I started off by first centre drilling a pip on the end of each arm I then marked them out to give a guide as to where to cut away the meat,
I then drilled the centre 4mm hole, then pinned the two arms together with a 4mm dowel I then drilled one 3mm hole all the way through both arms, I then swivelled the top arm 180 deg and used it as a guide to drill the second hole in the bottom arm, flip them over and do the same to the other arm this way they must have the same centre distance and be symmetrical to each other.


Then into the four jaw and supported on the centre chew away the unwanted bits, then cut off the pip and finish off to shape with filing buttons.

This is how its looking

Stew