^^ Interesting...
Ximot, it's very easy to convert freebases to salts. I just put a few milliters of distilled H2O in a clean shot glass (well, like 5mL for AMT because it doesn't dissolve to a very high concentration and the whole point is for it to dissolve. Plus more water equals no burn I've discovered). It will float on the top and maybe sink a bit as you are familiar with. I then drop 2 drops of 30% HCl (muriatic acid) in the shot glass and stir vigorously for a minute or so. The freebase quickly forms clear crystals, maybe slightly white, which settle on the bottom. Sometimes larger crystals form, which I crush to aid dissolving. I then make sure my bowels are empty and by the time I'm ready, the AMT HCl will have dissolved totally or very, very close to totally. Then suck it up into the syringe and proceed as normal. AMT provides a bit more discomfort initially than most chemicals, and the feeling of having to crap lasts a little longer, but it passes by the time it's coming up. It's not a huge difference to oral like most chemicals, but it's better IME in every way.
Careful with the amount of HCl... I've found 2 drops to work well without leaving excess unreacted HCl in about 5mLs of water for doses from 30mg to 80mg, although with 30 and below I use about 1.5 drops if I can manage.