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This is my homemade tool to remove headset bearing cups from a bike frame. This is similar to the Park Tool RT-1 Head Cup Remover tool. It cost about $3 to make. I made it from a piece of 3/4″ electrical conduit that I bought at the hardware store. The only tools used to make it were a vise, hack saw, and a file to smooth the burrs. I have seen some people make them from copper pipes, but the price of copper has gone up, so copper pipes are not cheap anymore.

Here is the Park Tool version:
http://www.amazon.com/exec/obidos/ASIN/B000WY8LPK/ref=nosim/rjthebikeguy-20