Shortening a metal pipe...

[TheMadMonk]

35. Quick and dirty. Since you only want 1/16 pack...

...the base of the pedestal with a bit of something rot-proof and use a mold resistant silicone to hide the gap.

Strikes me that if you haven't already cut into the wall this is the simplest and cheapest method.

Also drywall anchors with a generous helping of glue should be more than sufficient. You'd be surprised at just how much weight drywall can support.



A trick that's useful to know when working with silicone is that it won't stick to soap, oil or grease, letting you paint your masking into very complex curves if necessary. However, you need to use an ice-cream stick (or similar hard edged, round ended device) to smooth it into place. A finger may remove your mask letting the silicone stick where you don't want it. Obviously, unlike with paper masking, you need to let the silicone harden before cleanup.