Hello to all, coupling link pin is straight, and should be a "tight slip fit??" (is that like an oximoron??) I have run into some that simply will just never move, heat and a press was my only choice at one time in my life... now being older, aaannnnddd.... wiser?? Nawwww.. Anyway, now I would soak it in penatrating oil for how ever long it takes.. and the initial bust loose punch would be a thick dia. with just a short correct dia. push end.. (you can alway bring out the wimpy punches after you get movement)....and into the arbor press we'would go.....
... I only use hammers after a few beers... results then, usually are fairly predictable...
Good luck, best to all, til...lat'r...GT
BTW, IMPORTANT!!!! first, you have to make a heavy duty support fixture for the toggle link to press dead nut flat... not kind'a flat... but flat punch end, total contact to flat coupling link pin end... Any extra movement / flex anywhere will steal your thunder... only then, after we have NOT done this, do we get out the beer....