A tuck mill, also called a fulling mill, was used to finish woven woollen cloth: the fabric was beaten repeatedly in water to thicken and mat the fibres, a process that required its own dedicated waterwheel and machinery quite separate from the grinding of grain. That two such mills sat side by side here, separated by only about five metres, tells you something about the practical ambitions of whoever built this complex.

The 1842 Ordnance Survey six-inch map records the site as the Gearagh Corn and Tuck Mill, giving it a name that preserves both functions in a single breath. The tuck mill itself is a compact structure, its interior measuring roughly 4.67 metres north to south and 3.12 metres east to west, with a wheel pit running along its western elevation where the waterwheel once sat. What makes the site quietly remarkable is that a small bevelled gear wheel still survives on the ground. A bevelled gear, in which two toothed wheels mesh at an angle to change the direction of rotation, was the mechanical heart of the mill, transferring the turning force of the waterwheel into the motion needed to drive the hammers or rollers inside. To find one still present in a long-roofless ruin is unusual.

The corn mill stands just a few metres to the west, recorded separately, and together the two structures suggest a working complex that served both the agricultural and the textile needs of the surrounding area. The Argideen is a modest river by any measure, but clearly sufficient to power two wheels in close succession at this spot.