L.e.wilson trimming cutter.

[CROWMAN]

I need some info if possible from L.E.Wilson trimming tool users please.

A friend several years ago made me a trimming tool, composed of a cutter the one end and a hexagonal rod the other from which you could run a small electric screwdriver, it's always worked great until now.
It's not now cutting properly, I assume it's lost it's cutting edge over the years, so I need a new one.

Unfortunately my friend, who was a machinist, died a few years back, so being with no knowledge of machine cutters, now need some help on the type of cutter to get.
There are no model engineering society's in my area or similar to ask, so I'm at a loss.
Can any one help?

Thanks for any/all replies.