Wow! it's been a long time since I worked on these. But I did notice that there were a few of the files missing -- so I uploaded them. Make away!
I made the Block and Tackle - Pulleys by SteveWall with two variations -- instead of using wooden dowels, I made a second pulleyplate adding the "dowels" to it, making a male/female assembly. I also used a single 3mm x 22 cap screw in the center to fasten it together.
I've now added the half-sheave as requested.
Make all the pieces from SteveWall's version and add my male pulleyplate to one side and his pulleyplate to the other to assemble each part.
I used the 3mm x 22 cap screw and two nuts in the center.
If I tightened the screw too much the wheels would not turn freely so I used the two nuts so it could be looser without them falling off.
You need to make two half-sheaves for each part of the block and tackle.