Are very "polished" where the "sags"

From salient joints protuberant,

Grow shiny with continual friction;

But "polished knees" in poet's diction

Strike one as too exuberant.

Say varnished elbows, burnished knuckles,

And you'll elicit scornful chuckles

From Muse and from Mechanic!

Selections from the terms of trade

Would put, I'm very much afraid,