So my husband put the post in a vise and carefully pulled the knob off…and whoola!! no square, no slot…just a post is at the end of that knob…and the rest of the post does not seem to want to come off…so I think I will try to clean it as is and reassemble it. 
Do I use Bob’s solution (99% alcohol, oriec acid and ammonia)? or what…guess I’ll go back and watch the video again…the broken main spring has a hole at the end…do I need to replace the spring or can I just drill a hole and use the old one???? lol 
And has anyone noticed my picture taking is improving???!! 😆
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