Fitzo you were correct when you said "I didn't know how many people would know about Rusnok mills, so I shared what info I had". I have never heard of them before but they sure are nice looking little tools. They look to be well made and compared to the price on the site fitzo linked to @ $200 for the one you're looking at I don't think I could get there fast enough. The type 100 Collets are very common , can't say I have ever used or seen the type "Y" used on the model 70 though. They are still selling them so I imagine you can get tooling & parts for them.