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Silver King chain adjuster thread size?

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Cycleologist

On Training Wheels
I have a possible 1934 Silver King / Hawthorne frame, SN 1673. A 1/4 x 20 in bolt fits in the rear of the chain adjuster threads approx. 1 inch but not in the front. It appears that a NON mechanic worked on the frame. Can someone tell me what the thread size should be so I can try to repair it.
Thanks for your help
 

TR6SC

I live for the CABE
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1/4-28
 
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