Abstract: An improvement in an item having a rear surface to be mounted facing a wall, the rear surface having a mounting structure including: (a) a rest surface that, in use, rests on a support structure affixed to the wall, and (b) a feed opening that serves as a guide for the placing of the rest surface on the support structure includes: a mounting dowel having a body extending from a mounting end to a marking end, the body being formed of a conformable material proximate the mounting end, wherein the mounting dowel is secured at the mounting structure by means of the conformable material being compromised by the contours of the mounting structure proximate the rest surface such that the conformable material is conformed to the contours proximate the rest surface and held thereby; and a marking substance at the marking end of the body.