I am a little confused here. are we talking about earmolds tubing or the plastic horn on the hearing aid ?
I don't use tool to put new tubes in my earmolds. I just take thee old one out and make sure there is no obstruction with a hobby pipe cleaner. just insert the angled tip into the back of earmold and push in till tip sticks out from canal part and pull steady.
You seem to be referring to the horn or tubing that is part of the hearing aid ? How about posting pics so we can see how we can help you better.
