That's what I had already suggested you said you tried it already

Originally Posted by joelhague View Post
Have you tired completely unscrewing the black collar off your machine . then sliding both halves of it over your silver part of your grip shaft. Then attaching all of those together like it was one piece . it should have no problems going on far enough none of the silver shaft is left exposed. First step see if the collar fits over the silver part when fully unscrewed and off the machine
Yes I did. It simply wont tighten unless the shaft is lowered. Its like its hitting something but I can't see anything in the way. Again, the disposable slides right in easy breezy.