When I worked in a shop a few years ago in downtown Washington DC a issue that we came across about once a week, especially during winter, were completely ruined bottom brackets.. A city of bike commuters would abuse their old school Trek and Raleigh bikes, letting the bottom bracket rust out (among other things.. Using our handy cheater bar we would normally be able to break free the bottom bracket that possibly hadn’t seen the daylight since 1970 when the bike was built. 1 out of 10 times, threads would come with the bottom bracket and left the frame about useless.
Velo Orange now stocks a Grand Cru square bottom bracket that doesn’t require threads. How does it work. As you screw in the bottom bracket cup it pushes the sleeve out and into your bottom bracket in the frame. Now round up that “useless” frame you have laying in the basement and fix her up!