Stay away from your glans while stretching. With your thumb and index finger, grab just below the frenulum scar/mark (something around 1 inch away from the glans).
This way you can avoid most of the skin stretch and target more on the inner penis.
Also, to feel the stretch you must be totally flaccid and with enough gripping force to pull everything inside.
Start 6.8” x 4.7”
Now 7.5” x 4.9”