I know i have seen it before, but now all i can find is "Nicholson handle size 1"... well all the file handles i find at homo depot are letters... C...D.. sorry if its a dumb question but what size handle do i need?    

Can't help ya there. Mine all have numbers on em.

I would just take my #49 in with me and match it up to something. They can't accuse you of stealing the rasp because they don't sell them.

true enough.

Get a BIG handle,you will thank yourself later when you are really hogging off wood.

My Nicholson #49 is on the left.

Thanks Eric, will do.  what im really asking about though is the size of the hole. if I am to believe Roy, i want a really tiny hole... for my really tiny... well... you know....    

I made one from a 1" diameter branch. Epoxied it in and added an atrificial sinew wrap.

The handles in the picture have a threaded hole for the file tang, just screw the file onto the handle.