Hi everybody. I want to remove crank arms, but thread on the right side is deformed.
It looks something like in the picture. Only the two first threads are like that. Afterwards it is perfectly round. Will that ruin crank pullers threads? How can i fix this?

Thank you!

Park instructions for using a Bike Research tool to restore the threads.

You might have to use a round file to open the hole up a bit. If a bike shop near you has the tool that's the best option if you don't work on a lot of bikes.

or you can file those first two threads back to round and then put your puller in. Use a lubricant so it doesnt get stuck. BE VERY CAREFUL you dont cross-thread the puller.

-SP

It is highly unlikely that you'll damage the threads on your puller - if it is a decent tool - as the tool is (should be) hardened steel, and the crank is aluminum. At worst you would have to use a file card (tool for cleaning files) to get the aluminum out of the threads.

Thank you all for advice! It was really helpful. After quite a bit of time I managed to get the crank off. It was way more damaged than I thought.