Tom,
Sorry for the lateness of this reply, I’ve been working way to hard lately.
At any rate, I found a STJ was too large for me to get a comfortable seal, and I didn’t feel comfortable wth the thickness of the glass.
I’ve been using a mayonaise jar (I *think* it’s 2 quarts, might be 1). The opening size difference doesn’t visually look like much, and I haven’t measured the opening, but I get a much better seal, and it’s a nice thick (relativly speaking) jar, so I don’t worry so much about it going bang.
Mechanically the only difference is the lack of a place to “plug in”.
I went to the hardware store and got 4 feet of plastic tubing, the same kind I use on my fish tank O2 pump, then I grease everything up good (including the tube), insert the tube, then myself (I nicked my sack pretty good doing it the other way around), use mouth pressure to get the suction going, then I just yank the tube out of the jar (make sure to grease it also!) when I have the pressure up to where I want it.
Getting out is easy, just stick a finger between the rim of the jar and your sack and it’ll kill the vacum.
The big thing to keep in mind, is LOW PRESSURE! It’s *real* easy to get carried away. This is a totally different sensation, as opposed to penis pumping, and I know I found it real easy to get carried away by the moment, so to speak.
For me the first few times I did it, I swelled up to the size of a mid-spring orange (about the size of a softball) so, of course, my first reaction (aside from “Hey Honey! Look at this shit! WhooHoo!”) was, “hmmm more pressure/longer jar time must be better”, and gave myself a couple of thrombosed veins. Consequently, I haven’t been ball-pumping lately, while I wait for things to heal a bit.
10-15 minutes a time is the general recomendation, according to various web sources, with about 2 sessions at a time when you’re first starting out. Pretty much the same rules as penis pumping apply here, espcially the low pressure/short stay rules.
I doubt that ball pumping will really do much for your PE efforts, the effects seem to be short term, even for the guys that do it religously.
IMHO, It seems to be more a “freak show” thing than anything else, but it’s still fun. ;)
I hope that helps ya out a bit.