Spirit level for opitcal sights (air gun)

thingiverse

This system may be useful to narrowly mount your optical sight. this supports are sized for 25 mm turrets but you can scale it if needed. it is not necessary to print both the sideward one and the upper one, but i think the latter is more accurate since it has two costraint points. this is where i bought the levels: https://a.aliexpress.com/_mLlZwgc