Here I am with bumping gain.
It seems that when I hold the cylinder in my hands it is much easier to open it using the bump technique than when it's set in a vise. I tried to experiment and hold my hand tight simulating the vise. Still it takes sometimes 1 hit to open a lock when I hold it in my hands, while sometimes it takes me more than a minute to open it while in a vise. I've even measured the strenght required to open the lock so I can pick it for the first - second time. Again when doing the same while in a vise it won't work so fast.
I've tried to find an explanation for that, and came up with a suggestion, that if a vise is also vibrating then the energy passed to the lock will also pass to the vise, while my hands (skin tissues) are more springy.
Anyone has an idea regarding this?