wiper linkage arm fitment

ive got my new plastic bushings in on linkage arm,greased and small hole pushed in back ( searched on this forum) but trying to press the bushings and connect the arm seems tough as hell and im ready to start chucking wrenches,i read on here its a PIA but am i better removing all wiper assemby or just keep trying using my mole grips.These bushings are rock hard n dont flex which aint helping.

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