1) A spelling of ‘maul’, which is usually defined as ‘a massive hammer’ of any kind (OED). Yorkshire examples indicate that malls could be large or small, and were commonly made of iron as well as of wood.
1371 Et in 2 novis mall’ emptis pro quarera frangenda ... 21s, York
1423 pro iij malleis magnis de ferro … ij malleis parvis, York
1569 my greatest iron malle, foure yron wedges, Shelf
c.1570 with mell and wedge , Woodsome
1611 a great mell and certeine rules, Barwick in Elmet
1612 all the wodde in the fold together with all the axes, malls, hatchetts, Eccleshill. In 1713, the cutler John Shirtcliffe had 1 Vice 1 Mall 1 workboard and other tools recorded in his inventory .