JackNco wrote:In a perfect world, but any kind of resistance at all, as in the cylinders touching till apply tension to both.
I must agree with John(JackNco) here - whilst in theory what Linty said is correct, in real life there is going to be some friction between the 'inner plug' and the sleeve that operates on the control-sheer line.
Thus there are going to be pins binding at both the control and operating sheer lines when using a conventional tension wrench.
That said, it is still certainly possible to pick these locks just using a conventional tension wrench, but luck comes into play more than it would when picking a standard pin-tumbler.
There are plenty of posts here where newbies asking for help - they have tried to pick a lock on a door with an SFIC lock, they were using a conventional tension wrench, and all of a sudden the core pops out of the lock.. Thus you can get lucky & end up picking either the control sheer-line or the operating sheer-line when picking these locks using a standard tension wrench.
A Bogota rake is an excellent tool when using a standard tension wrench - it allows such fast manipulation of the pins that you are going to get one sheer-line or the other, sooner rather than later. The number of possible combinations, as calculated by John above shows why this will help.
...Mark