In my opinion theres no brief fix. Considering that theres no worry on that Element of the frame I would use heat to straighten it. The frame is probably just one.5mm thick (.060") so it shouldn't require a particularly significant temperature. Long story brief I tracked down a 1986 four https://awp08494.livebloggs.com/39530069/the-fact-about-awp-slot-that-no-one-is-suggesting