I found at my local hobby/chain saw/motorcycle shop several boxes of files for use on chain saw chains. Come in several sizes,fine cutting & straight from one end to the other . I have found uses for them on every plane I have built the last few years . Time for me to pass it on ,sorry I took so long . They are also cheap & don't rip up balsa like a rat tail one . Try one, Max

Do you have any picture?

No I don't & have never tried to post them on here. If you will send me your e-mail address I will send it to you . Max

Sent you a PM

I bought a yardsale tub of all u minium pop rivets assorted sizes of shank and diameters, have used them for a number of fixes, sleeving wallered out wheels and mix matching axle and wire sizes, use them for bulkrhead sleeves, and other little projects, I'm getting ready to build some flying guide wires whatever you call them.. lol ... I have an idea that begiins with an "r".