[The Phoenix Reborn]

I recently purchased a 1-4x scope for one of my airsoft guns, but the thing came very off-level with ring screws loose out of the box.

I have a small magnetic bubble level which I can place on top of my scope, and I've done a bit of reading and YouTubing regarding the general method used to properly re-level a scope. However, all the stuff I researched involved using a gun-vice to keep the gun itself leveled, and getting a gun-vice for airsoft is a bit overkill for me.

What methods do you use when re-leveling scopes on your guns? Specifically, what do you use to keep the gun itself leveled and secured so you can freely focus on adjusting the level of the scope?

Thanks in advance!