I didn't build one, but yesterday I used a spanner wrench that came with my 4.5" Craftsman Grinder. It fit perfectly in two holes. I used a pipe as leverage and mine came apart.

Not sure that I can get enough leverage with this tool to reassemble them tightly enough, but I should be able to use a second spanner weld them to an appropriate socket to engage all four holes.

sorry, no pics.

 

I just bought the tools from RE because I have had to mess with the joints fairly regularly, but I have heard that a chevy front hub socket will fit if you grind the pins a little and those are only $15 around here at auto zone and checker. I havnt tries it though.

 

This might help and is much cheaper. It works great and is only $3.99 at Harbor freight
- Harbor Freight Tools - Quality Tools at the Lowest Prices