taking apart 46mm kayaba forks

You can't get the rod out by removing that crimped ring anyway. You need to remove the cartridge head from the cartridge tube in order to perform the work you are attempting. You would need some special tools to do this with. The staking has to be filed down or ground down. You need to be very careful when doing this. I suggest you find somebody that has done this before and have them show you. Maybe a local shop would do it, but be prepared to pay them even if they do allow you to witness the procedure. If you screw any of this up it will be pretty expensive to fix.

2 wheel ;youll need a cartridge holder and some heat and a good drill press with a depth stop to do it best youve got to drill out the peened in parts on the cartridge where they screw together then disassemble the topand lower tube. If you did a search on this forum im sure some stuff would show up as its all been discussed before Youve also got to grind down the staking on the end of the shaft to get the nut off You might need a die or thread file to clean the end up. Id probably leave it alone if I were you unless the valving seems fouled up with swarf or something , even then id try to flush it out if possible first.