#3, Mike, I would not use a brick, use a block of wood. The brick can chip or shatter, which on a bike is not a huge deal except for maybe getting a piece in your eye. Watched a safety film in tech school where the guy had supported a dozer blade with cinder blocks and they failed while his foot was under it, quite graphic.
Even having a cotter press is no garrantee, it destroys them as well as a hammer.
If you do destroy one, go to the oldest shop in town, they will have some hidden away(I have at least a hundred)
Take the old one with you, they come in a couple of sizes and profiles.
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I am in the woods and I have gone crazy.