Praxis Crank stripped!

[Buckle]

Whilst removing the Praxis carbon cranks from my Yamaha Motor the extractor bolt on the drive side sheared! Instead of pushing the crank off it pushed the threaded retaining cap through its threads thus stripping the inside of the crank. Not good. The left side came off as it should. I am now faced with a stuck crank arm which doesn't have any threads for an extraction tool. If anyone has an idea of where to go from here please let me know!
Thanks.

 

[Pdoz]

Use a persuader - and next time remember which crank has the reverse thread.

 

[Buckle]

Thanks. However, you misunderstand, the bolt was being turned the right way and pushing against the threaded collar which pushes the crank off. The bolt failed (light alloy) as the crank must have been seized on the spindle.
I'm not sure a hammer on a seized carbon crank is the answer! If it was alloy I'd just cut it off with a grinder.

 

[Pdoz]

Thanks. However, you misunderstand, the bolt was being turned the right way and pushing against the threaded collar which pushes the crank off. The bolt failed (light alloy) as the crank must have been seized on the spindle.
I'm not sure a hammer on a seized carbon crank is the answer! If it was alloy I'd just cut it off with a grinder.

Mine was an alloy crank (2018 giant) and tapping around the crank worked . I'd originally over tightened everything by " removing" it the wrong way If we can believe the carbon frame / wheel threads those carbon cranks should be just as strong as alloy?

 

[Buckle]

Thanks. I tried tapping and hammering to no avail. In the end it took an angle grinder and punches to brake off the crank. Expensive maintenance! This was on a Giant reign. Any suggestions on a new set of cranks?