Excellent! I can appreciate a useful application of found materials.
What you see in this image is an example of CAD, good old cardboard aided design. The challenge is to create a simple pully block which can be hooked over a 1 x 1" cross member of a hay elevator while straddling the chain trough. The cardboard will serve as a template which should allow me to cut a piece of steel and bend it appropriately. The circles denote the position of the holes for the pully axle. The pully was turned from a scrap piece of 2" maple left over from a couple of other projects. Note it is still 8 sided at the circumference.
I already have a pully hanging from a beam . In the past I have jury rigged a rope for getting the hay elevator down from its storage rack under the rafters in one part of the barn and lifting it back again a week or so later when the hay has been put in.