Sightmatk bubble level - SightMark Bubble Level Rifle Scope Ring

I bought it because i thought it would be easier to swap between scopes than the two clamp screw type. But it doesn't serm to hold position with appropriate torque. A bit of rosin powder fixes that, but thsts more trouble than itvis worth for moving it between scopes. Oh well, serms durable enough and the bubble is easy enough to see.