That was quick! Thanks deQuincey!
So I just insert and turn until I feel the "bite" and then resistance to further insertion? exactly ! if you turn it with your hands, you will feel clearly that there is a moment in which you can not continue turning it anymore, so STOP !
then you can check continuity with a multimeter !
Any suggestions for achieving a clean, square cut?
please don´t laugh, i use those special scissors used for cutting the roses in your garden (not kidding, they are the best for any cut involving rubber hoses, wires, etc )
if you do not have them use this thin sharp blades (we call it a cutter, right ?)