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Yes 18.2 mega ohms is the highest purity 10 would be deemed accetable I would think for model boilers.

I used develop methods to analyse boiler water for power stations using ion chromatography, the requirements were low ppb (parts per billion) chloride, sulphate and other ions such as flouride bromide in other words any ion that could produce an acid eg chloride + H from water Cl will yield HCl...

Hi Brian, I got some castings for the Kiwi engine that is a motorcycle like OHV single, haven't done too much yet I am too bogged down restoring full size motorcycles. Lots of info on the web for this and most parts for completion available from: https://www.hemingwaykits.com/category-90

I purchased a test bar (25mm x 300mm) a lot cheaper than a level and useful for tailstock alignment as well. make sure to check horizontal and vertical alignment with a dial gauge on the cross slide. as others have mentioned set screws are available on the head stock to adjust lateral alignment...

Hey Bob, Nearly forgot I had the same issue after moving my Ender3 V2 I had tightened everything up, redid the new yellow springs and noticed they needed stacks more turns on one back corner (all loosened off 3 full turns before i adjusted Z microswitch. When leveled the back-corner was nearly...

Bed must be cold to remove parts, I usually give the bed a good wipe with IPA thats rubbing alcohol not Indian Pale Ale unless after 5pm. I then rub a bit of glue stick in a zig-zag over the bed. Next pour a big mob of IPA on the bed a use it with a paper to spead it around. Bung the heater on...

With cast iron castings the surface can be often like glass (very hard spots) so take a good first cut (10-20 thou) rather than just rubbing the surface lightly else you will take the edge of your tools real fast. Sometime it pays to go over the castings with the side of a coarse file to knock...