Take the spring off both sides, it makes it easier.
Make the bolt as short as you can and still leave room for the pin hole.
Then round off the end as much as possible.
I used a band saw, a drill press, and an angle grinder with a flapper disc in it. But I could have done it all ( and have done far tougher things ) with just a file, drill and hacksaw. You probobly have a neighbor with all the necessary tools and a missing $10.00 hole in his wallet.