Scope Bubble level
thingiverse
Scope Bubble level for 1inch or 30mm diameter tubes Hardware: Bubble Level: 9.5mmx25mm https://www.amazon.com/SODIAL-Acrylic-Bubble-Spirit-Diameter/dp/B0774MWSCS/ref=sr_1_15?ie=UTF8&qid=1547568605&sr=8-15&keywords=bubble+level+tube (1) small zip tie
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