Spirit level vial holder
thingiverse
Holders for spirit level vials which can be bought from Amazon or elsewhere (think I bought mine on Aliexpress). The following versions are uploaded: 11x55 (diameter x length) 12x100 (big one!) 14x70 These can be screwed to a beam directly, or you can put some springs underneath for adjustability. Got the idea from a time life/ woodsmith book "Fine Hand Tools", which has a diy torpedo level with a wooden adjustable holder for the spirit level (page 20, the shape is very clunky when compared to originals by Rabone&Chesterman). I made a more elegant 3d printed version :-) I glued the vial in with a bit of epoxy.
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