Ok so after trying to make an insert I then found a local welder who welded a piece of bar approx the same thickness as the broken tab, took him a couple of minutes and free of charge. (nice man 
I then cut to size and then filed by hand, drimel and bench grinder.
This got me a good enough fit to put it all back together again and have a working spring loaded handle.
The images give an idea of the process.




I then cut to size and then filed by hand, drimel and bench grinder.
This got me a good enough fit to put it all back together again and have a working spring loaded handle.
The images give an idea of the process.


