Need help with collet size: PC Mill -30

[oxford]

I want to take my milling to the next step and realize I need some collets to do this.

Right now I am using a small piece of drilled out and tapped aluminum bar stock to hold my end mills.

Sometimes it works....sometimes it is ugly.

The only info I found was from a NZ selling a similar model who said the collets have a 10mm OD.

Anyone know what kind of collets to use?....or

Are there measurements I could take of the inside of the spindle where the collet fits in to find out if there is standard type of collet to buy?


Thanks

[oxford]

Here is a crude cross-section of where the collet would fit in.

Maybe the included numbers may jog somone's memory about familiar collet sizes.

....I hope.

Thanks for looking

[oxford]

I finally ponied up $25 for some an ER11 set. They fit nicely. Now I just need to test their runout.