I'm building a Tamiya Early Tiger I with the Aber big set 35K01, and I've been stopped by the tow cables provided in the set.
I've no idea, beyond filling with solder then filing down, how to taper the ends of the provided tubes to form the collets. And if I was to fill and file, how would I keep the cable centered?

Any help would be more than greatly appreciated

*edit: Just in case I'm not clear above, I'll post the step I'm having issues with below:
