square taper bonded to crank arms
You just need to use a thin layer of grease to prevent bonding between steel and aluminum. Also if you’re having great difficulty when removing the crank arms, spray some liquid wrench in there and wait. Make sure that the puller is fully screwed onto the external crank arm threads to avoid stripping as opposed to partially screwing them on. Finally, remember that force over time means that applying less force over a greater period of time is equivalent and often greater than a large amount of force applied all at once I.e. strong arming. What that means is that you can set up some tension on the puller and leave it, and just keep applying a little more tension if it still won’t budge. Almost like magic, it will give way eventually.