I just came up with this idea today, I sharpened the end of a computer case slot cover, I use a proper hinge tool and guide then use the sharpened slot cover to finish the job, works great. 
Dwayne

As a saw or a knife?  In other words, how are you getting the excess material out of the slot?

Hi Tim
That's a good question, probably as a knife but maybe it pushes the material into the slot but I can't knock the results it worked great.
Thanks Tim
Dwayne  

G'day Dwayne

It looks like a very good idea, what does the end of the cover strip look like?

Cheers, Geoff

G'Day Goeff

Here ya go.