alfredbobas wrote:First - i was trying to open the lock to doors in my basement, the plug turned about 90 deegres and it stopped (in the other lock in the same basement i tried to open plug turned about 75).
If I'm understanding your question correctly, you are able to get the plug to turn once picked 90 degrees, but the lock is not opening? Is that correct?
I just checked a couple of deadbolts I have laying around, and that's pretty typical behavior when unlocking. The plug will turn 90 degrees from vertical (key inserted) to unlocked. The plug turns slightly less than 90 degrees when locking the deadbolt.
alfredbobas wrote:I tried to push more with tension wrench but it would only come to brek a tool. I tried even put a key from difrrent lock and turn but it didn't help either.
I'd have to agree with commodore on this one. If you are applying enough tension that your wrench is about to snap, or bend, that that is way too much tension. The only time I have ever had to use heavy tension, was on a plug that used a spring to return the plug back to vertical once tension was released. But even then, it wasn't enough to bend my wrench.
alfredbobas wrote:So i wanted to ask if i am doing something wrong or maybe the tools could be not good? Or maybe the lock is just undefeatable (third lock i tried to open was open as normal). I must say that a common door cylinder locks not in door but in my hand I can open normally.
I'd be hesitant to blame the tools, if the plug is able to be turned once you have picked it. Unless, the plug is able to be turned with, or without, being unlocked.
alfredbobas wrote:Second question is more fillosofical: i've found that if i am opening lock to the right side (pushing tension to the right) it is less difficult than when I am opening lock to the left. Is it only me or that is just the rule

?
Certain locks are easier to pick to the left, than the right. I think it has to do with a couple of things, though. I think the plugs machining may have something to do with it as well, as the tolerances may differ from one direction to another.
I've got a bunch of BEST locks, that have multiple key options, are easier to pick to the left than the right, mostly because I typically pick to the core removal shear line, before I ever hit the unlock shear line.