I f you can follow this ,good. Two positions required in the jelq, whether wet or dry; the base position and the final position just below the corona of the glans. In wet jelqing you can start at the base and with adequate lub, simply slide to the position just below the glans. In dry jelqing you cannot start the jelq at the base. The dry jelq assumes that you have plenty of skin that literally folds over itself to accomplish the total shaft distance from base to glans. With your penis un-retracted and in a normal semi erect state you find the skins equilibrium point about two thirds up from the base to lightly form your overhead OK grip. On myself, this point is about an inch below the glans. Test slide to the base. You should get there without unduly pulling on the upper end skin of the glans. Now, without releasing your grip, move outward to the glans final position. If you can move comfortably to the two positions you have found the right “skin equilibrium” point for you . If not make an adjustment. You will always start your jelq from that point on the shaft and with very light pressure when you arrive at the base you clamp to whatever higher pressure you require and move to the glans.
This was my answer on another thread—maybe helpful. With good technique, dry is better for the un-cut.