I'm a happy bunny. Finally have a freely moving height adjuster for the con-rod boring jig.
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As an added bonus, as you'll note from the photo's, the heating method I used has also given it a black finish.
Repeated electrolysis, dousing in oil etc. had failed, so yesterday I heated it then followed it up with a quick dunk in the electrolysis vat today, & that did the trick, & also blacked it.
I couldn't be arsed digging out all my propane gear yesterday, so decided to use the stove instead. Round tobacco tin to enclose it, (save it getting damaged), then packed wood ash around it in the tin, lid back on, then just built the fire up over it & left it in there to do its thing.
In the tin & packed with wood ash.
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In the fire.
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Drilled 3 small holes in the lid just incase of any steaming/gassing.
I was roasting my knacks off in the flat yesterday, with the stove going in this weather.![]()
Have to try that.

I discovered this method.
Soak in hot citric, rinse with boiling water then into wd40 until it cools. Let it drip dry overnight then dry off with a cloth. Leaves a black finish that seems durable.