The Paterson Universal spirals work differently - the ball is in a tapered groove, it grips the film edge going one way but not the other, you just twist the two halves of the spiral back and forth and the film loads itself. No contact with human hands except to get the first couple of inches in, which is always done by pulling on the "leading end". Unloading, you just pull the loose end outwards and let the film pull out between the spiral "plates", again minimal hand contact, the bit of the film where images are formed never touches anything (except hopefully the solutions!).

And it works exactly the same way for all film types.