Here is how I do a ULI squeeze.
Get my unit big but not 100% erect. Grab it around the base with an OK grip with palm towards the head. Now clamp with fingers around the base while doing a few kegels to pump in as much blood as possibe. Squeeze as hard as I can with OK grip. I have three fingers free on the same hand, right? Middle, ring and pinkey. With the OK grip still in play, lightly and slowly squeeze with the free three fingers. Be careful. There is a lot of pressure involved and you can hurt yourself. I hold these for about 30 seconds each.
v