UK bellhanging firms Being on the coast in Cornwall, I blocked up the louvers on the West side with a sheet of ply board screwed in place, as this was the direction of the prevailing wind and rain, and looked down on the pub and some houses. A few yrs. later, we were getting Jackdaws bringing in heaps of twigs for nesting all along the side of the frame, so when they finished nesting, I removed all the material (several bags) and fastened a stainless steel mesh (from a builders merchants) across the louvers, fastened in place by wood battons screwed around the edges. A bit pricey, but will last for ever, whilst maintaining good ventilation in the tower to minimise dampness on the bell frame.