u/fivepeicereturns

Hey all, a month or two ago I switched from bathmate to a cheap Amazon air pump with a wide flat base (like in the pic) just to test air pumps out, I do low and slow marathon pumps, 4-6 hg for an hour + and finish the last few minutes around 7-8.

My issue is, after about 30 minutes, it starts to hurt. Not my dick, just like around the bottom of my dick where the edges dig in when I start to pack the tube, and the flat base digs into my fat pad.

Is there anything I can do fix the pump I have? Like taking a deburing tool around the inside edge or heating it enough to make it pliable and round it over? Or do I just need to spend the money on a better pump