Just a small discovery I wanted to share with the forum. Until now, I have used talc to improve my grip while stretching, but I have found a better way, at least for me.

I take a sheet of tissue and separate one layer, pull back the foreskin and wrap it around so the area under the head is covered. This grip I now get while stretching is much better than with talc - there is no slippage at all, and I feel I have more control of the stretch so I don't pull so hard.