I am planning on providing the Merlins with options for perching while weathered, in my house or their mews. One of the perch designs I am making for the falcons are some blocks. These are the components I am using to create the blocks:

All the metal parts are stainless steel. The rod is 1/4 " x 14". The fender washers are 1.5" with a 1/4 hole. The washers will be welded 2" and 8" from the top end. The top washer will have 2 small holes for screwing to the underside of the block. A 1" inside diameter ring is placed between the 2 washers for tying the leash. The block is store bought from a specialty wood supply shop. The top diameter is 3" and will be covered with indoor/outdoor carpet. The bottom will have a 1/4 x 2" hole to accommodate the support rod.