About to order the modified vacextender v4 - which size to choose?
Looking at autoextender. Com I’m not sure what size to pick. I’m average in size, and the site offers size small, medium and large. While a know what mm I need on the rods to connect the vacuum system to my extender, I don’t understand what the small-medium and large option represent, the vacuum cylinder? If so, what to choose? The site doesn’t bother to even mention anything of this. Thanks