Keystone with Briggs

#1
Hey I just picked up this Keystone TMB200 with a Briggs n Stratton for $75 Canadian(That's like $50 American LOL). I put this in US Vintage because the Bikes were built in North America and someone put a Briggs in it. How do I straighten sprung forks?
Here are some pics of my latest find:
 
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