205 GTi 1.6 Bendix brakes-Advice please

[arbor 2]

I'm replacing the discs and pads on my 1.6, a job I've done  few times over the years. However, I cannot get the sliding retaining pin/bar in at the top of the the caliper carrier. What am I missing, any advice please.  From the outside in, pin slides in fine, it just won't locate to retain the inner side/piston pad. The pads are symmetrical.

 

Thanks

Edited April 4, 2021 by arbor

[bondo 6]

I had exactly this yesterday ( gave up) and this morning. In my case it was because. I had the innermost pad - the one with the wear sensor on the wrong side of the car. Although they look identical they are handed . Wear sensor wire was much slacker as well.