Big John
Guru
This may or may not help, assuming you haven't already solved it.
What we do at work (bike charity where I'm a volunteer mechanic) is slip a round headed bolt (one you might find in a brake pad) into the spindle end. It just fits loosely i.e. don't thread it in. Then get the inner part of your crank extractor tool virtually screwed all the way out to give you a bit more room. Then screw the outer part of the tool into the crank arm, finger right to start with (for god's sake don't cross thread it!) Then when you're sure it's threaded properly make sure you tighten it as far into the crank arm as it'll go THEN begin to tighten the inner bit until you feel it hitting the lose bolt you put in. Now you're ready to give it some beans, even using a pipe extender on the spanner if necessary. We work on some seriously old, very poorly maintained bikes and I can't think of an occasion when we didn't get at least the cranks off. I'm not great at written instructions, I'm more used to showing folks and they see for themselves how it's done but if you can understand my ramblings it does work. What's critical though is that you don't cross thread anything otherwise you're in proper trouble. Good luck 👍
What we do at work (bike charity where I'm a volunteer mechanic) is slip a round headed bolt (one you might find in a brake pad) into the spindle end. It just fits loosely i.e. don't thread it in. Then get the inner part of your crank extractor tool virtually screwed all the way out to give you a bit more room. Then screw the outer part of the tool into the crank arm, finger right to start with (for god's sake don't cross thread it!) Then when you're sure it's threaded properly make sure you tighten it as far into the crank arm as it'll go THEN begin to tighten the inner bit until you feel it hitting the lose bolt you put in. Now you're ready to give it some beans, even using a pipe extender on the spanner if necessary. We work on some seriously old, very poorly maintained bikes and I can't think of an occasion when we didn't get at least the cranks off. I'm not great at written instructions, I'm more used to showing folks and they see for themselves how it's done but if you can understand my ramblings it does work. What's critical though is that you don't cross thread anything otherwise you're in proper trouble. Good luck 👍