I hope it doesn't mess up the pump at all, been using powder only for 4 years, I still use the same hand pump without a gauge for more than 1 year and a half, I have a couple left that still work out of 3 in total. I might try vaseline in the future but I used to get serious skin injuries and lots of pimples on the shaft, sometimes 2 at once, very unpleasant, just from using different types of lube, baby oil, water based, a few others including shea butter and vaseline, neither would do, powder was the only way.
I also do the same with the MHM
cylinder. I also have small strechy rings I use but they don't do much without the MHM
cylinder pumping. One ring at the base and one below the glans will slightly increase the glans but the LA tube was the winner for me. I waited too long to buy it, the EQ increase alone was worth the money. Glans gains are very, very slow and go away very fast, but hopefully I'll be able to hold on to a bigger head in time. Also, using the MHM tube, blisters are not a problem like with the tight/packed tube.
Also, sorry for no pictures in the MHM, but they're not so impressive so I rarely take them. In time, hopefully, I'll take a few sets of pictures, I do have plenty of before pictures and the difference is obvious to me, but I have to find them in older folders and right now I can only access the ones I already have posted on other forums.