[Outcast (Carlton)]

I stumbled across a video on Youtube the other day which showed a chap 'improving' his focuser smoothness by honing the flat part of the tube with an oilstone.

This got me to thinking & this evening I examined the flat on my Meade 5000 Series APO. What I noticed was that the wear marks are on the outside edges of the flat area only.

Is this a bad thing...? would honing the flat area to level it improve my focuser in any meaningful way?

Is it simple to do?
Is it worth doing?
Is this something that could go horribly wrong?

Thanks in advance for any advice