Yep, they are the dogs……. I work in a boatyard and have to remove alot of screws/bolts that have been submerged in salty water for years :?
Mine are similar in shape to a tap (threading tool not a water giver) with a square drive on the non business end. I use a tap wrench to drive the little fella’s as this gives the most control. I’d recommend drilling a pilot hole, slightly smaller than the extractor threads, it makes it alot easier to gain purchase. Clamp your cranks down to, don’t want them spinning away into your man area :cry:
Bootfairs are a good place to look for them, old stuff, but generally the older the tool the better it is (better steel, made to last)
Don’t bodge it, you’ll make a mess of your kit and your tools. Do it properly the firsst time and save yourself time/money/injury/stress.
Good luck chap