Pumping is a very effective PE practice, but just few people give to it the time is normally given to other practices, such as jelqing, hanging or clamping. I can tell, for personal experience, that if you give the practice a correct amount of time (three hours a day) it will give you fast and impressive gains both in the girth and in the length department (cementing takes several months). For length, one has to use low time high pressure sessions, to obtain longer and longer extensions. For girth, one has to go for long (one or more hours) low pressure sessions, much better if using warm water. The base of the cylinder makes the difference in comfort. To me, as I know very well what is good for me, a home made customized cylinder is the best option. To newbies, LA, Kaplan or similar is a a good start up point. A vacuum pump may give you two kinds of discomfort:
1) base discomfort (which is the easiest to fix by adjusting the base shape)
2) head discomfort (which is due to excessive pressure)
Once the base discomfort is taken away (with a right shape) you only have to limit pressure to avoid head discomfort.
Doughnut effect is also a matter of excess pressure which can be avoided by wrapping before the glans
Putting warm water in the cylinder (absorbing) is the best way to obtain amazing and fast girth results
Diameter and length of the cylinder must be about one third more than your sizes
Jelqing (carefully) after a pump session increases the speed of gains, but, before sex is better to jelq it in the pussy and let her take any excessive swollen flesh. (do not believe when they say it’s too big…).
Perseverance wins