Pain While Pumping

I get a burning pain at base on underside where shaft meets scrotum while pumping. I pump at 4-5 HG. Burning continues for hours after pumping.

Any ideas on how to prevent this?

It’s due to too many sack skin being sucked into the tube. When this happens try to release pressure and then pull skin out and pump again.

Every once in a while pull skin out while pumped.

It’s most likely from some ball-skin getting stuck at the flange of the tube. Sometimes it could be due to your testicles getting jammed at the flange, as your ball-skin is gradually pulled into the tube over time. Two things you can do to prevent this are; (1) Seat on a hard chair before you pump and tuck your balls under your ass (2) Use a ball stretcher like this one 665 Leather Neoprene and Fetish Clothing: Ergo Ball Stretcher Kit by Sport Fucker™ to keep your balls outside of the pump

Happy gaining

Another method is to start with an erection and bone press the tube into your crotch as you begin to pump up and that will help keeping your scrotum from being sucked into the tube.

Are you using a properly sized cylinder?

Just asking because if the cylinder is too large more of your balls/ball skin is going to be exposed to the vacuum. Too small of a cylinder and it could be constricting something in that area.