Never seen tht failure on the forum yet.
You can see it was crimped in, so like ziggy says.
yea by looks of it - the plastic has snapped clean off
Anyway for the OP
i did some grafiti for you
Red Squiggle - Resin glue
Red Arrow - Resin glue in here
Blue arrows - Some small holes and then get some self tapping screws in this general direction
The screws dont need to be miles long
Not so short its not going to last
My other advice is this
Mark where the 2 should align up correctly (tipex or a Punch mark set or deep grooves what ever you fancy really)
Take the linkages out when doing this
As i would try to get screws all around if i were you - but again be careful not to overstress the plastic
I'd drill holes first - so the resin can ooze out the holes and it means the self tappers will tap into the plastic and set in the oooze

Those screws wont come out
If it fails again = new linkage
Ziggy