Picking a Masterlock "911"

[Gear Head]

I have a masterlock 911, the huge yellow padlocks with the black antishim guard on top. This thing is driving me nuts, its the only lock I haven't been able to pick. The back of the lock inside also feels pretty funny, I would disect it but I lack the security bit screwdriver to release it, and don't feel like hacking it up.
What is inside of there? I think half my problem is the tension bar, and the fact that the cylinder is spring loaded. It also has a wierd keyhole cover that prevents me from picking it in the other direction. I belive there is a security pin inside, but it doesnt feel like a spool, which are the only ones I have encountered. There is still something funny past it but I think I am feeling through the lock. It felt kinda like a ward, but I looked at the key and don't think there is one. No idea what I am doing, and this is probly the only hard lock I have in comparison with the others.

[stevelock]

will look monday to see if we have any in the shop . don't think its any diff from most of the other cyl. what keyway is it 900 or 600

[Gear Head]

It's the 900.

I think I just can't tension it right as I only have one size wrench, and it's awkward.

I also think my problem is I lack enough skill to open it, and want to keep trying till I can get it. I'm just wondering if there is some type of trick built into it involving how the cylinder can move around inside of it.

[wtf|pickproof?]

You should definately make some more tension wrenches from windshield wiper inlays. IMHO a variaty of tension wrenches is even more important than a large sortiment of picks.

[quickpicks]

They are the same a an M1 keyway but with five pins and the driver pins are spools. With a bit of practice this lock will be a snap for you. They are the same as the 6100 series of master locks and the only difference is somethimes the keyways differ.

[Gear Head]

Very cool. The only security pins I have encountered were spools, but this felt different to me for some reason.
I guess I will snap out some tensioners before I try again.