I use the smallest (3ml) icetool. It's 3/8" (9.5mm) internal diameter.
The prismaster is an oval - 3/8" at narrowest and 5/8" (16mm) at widest. It's only $2 at getsnus period com, so you might as well just buy one of those to try sometime. It doesn't make as firm a pris - instead of a plunger at the top there's a slider on the side. But it's 1/20th the price.
Have you seen "snus introduction for beginners" on youtube? Note the VERY important technique of drying the inside of your upper lip with the back of your hand before inserting the pris.
I made a DIY portion tool, too. I sawed off a 3ml syringe I had for my late cat. It didn't work well because the base of the plunger was a flexible rubber stopper. It needs to be a very hard surface to get a good pris.
). Actually I wanted to and forgot the last time. I was just curious about how much my improvised tool mimicks the real ones in the shape of the pris. It also does not make really firm pris even though it is hard plastic; if I want to keep it in for a couple of hours or have slower absorption, I have to use my fingers. On the other hand, I am useing Oden´s which is said to be difficult to bake, so maybe other ones will be easier to be formed by tools.
