To separate the assembly I had to chisel off the securing heads and then drill out the remainder to gain access.
The issue is that the rod has separated from the plunger so it looks as if these 2 pieces need to be brazed together.
Joining them needs to be good as the spring has a lot of tension.
Joining the plates back together could be done by some bonding compound as rivets might make the unit stand proud of the targa roof. Also the 2 securing screws that hold the catch to the panel would help keep things in place.
I need now to get someone to braze these 2 parts together to see if it works.
Regards
Alan