Evolution...hope you don't mean their powerfile?...I had one and I binned it.
Orange black&decker is a lot better.
I gave away my first B&D after 5 years use...when I bought the evolution. Turned out to be rubbish (looked the part...but it would fire the belts across the room)...looks good but is junk.
The B&D arms are replaceable too for about £5 a pop...evolution...not so much!
That's the one I would get....eBay used to have a supplier for the arms too. The little wheel on the end wears out after a lot of use on welds...but the arms are cheap.
I paid £28 for the file and £5 for arms...looks like everything is now double!
Evolution had a steel wheel...didn't last.
Unwanted one on eBay starting at £20...I would happily buy a used one too if it's had DIY use. Only bit I've ever killed is the arm rollers....and I filed a lot of welds over the years.
...The little wheel on the end wears out after a lot of use on welds...but the arms are cheap.
For that would look at using a 90 degree die grinder with roloc discs as can be found easily in various grades from 36grit to strip and clean scotch type.
Pretty much the same thing I was talking about as @tom2207
This is a cheap air one with the speed lock rolock discs which are cracking.