I dont know about yours, but mine has a button on one side that is pushed in and releases the knob/shaft. Its a '57, but maybe yours is the same. Hope this helps.
Jeff


"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."

1957 GMC 150