what is the historical meaning behind the working tool known as the mark mason's mallet

The mallet, designated as one of the working tools of a Mark Master, carries the same emblematic significance as the common gavel 1. Its moral instruction centers on self-discipline and refinement: it teaches the correction of irregularities of temper, the curbing of unbridled ambition, the depressing of envy, and the moderation of anger 1. Symbolically, the tool serves to remove the excrescences of vice from the mind, preparing it, like a well-wrought stone, to take its proper place in the great temple of nature 1.

In present practice, the mallet is paired with the chisel as the characteristic tools of the degree, both appearing on the ribbon supporting the keystone jewel of the Order, as Mark Masons' Hall notes.