Art, just make some more signs with your router and i am sure that you can generate enough dosh to be able to holiday down under!
We use ER25 collets on our machine too. The " on size" type looks to be the way to go. We will get some.
Ours is a manual tool change machine. Your method of securing the bits in the collet and nut makes a lot of sense.
That was a very informative post. Thankyou.
Rocket.