This is an old listing I found by searching and I don’t know if there is another discussion thread for these latches. These single leaf springs are all broken on mine. They are made from a heavy (relatively) gauge for the short arm lengths and angle of rotation, which is a formula for excessive stressing and early fatigue.
What I have done so far is to make my own from two sources.
One is cutting a suitable length from a st. steel dipstick and bending the multiple curves by hand around round-nosed pliers. They are working well but are a bit lighter strength.
The second is to cut strips from an old clock spring and do the same. The problem I had with the first spring was that it broke during the bending procedure. The other clock spring material seems to take the bending. I have a theory that if a thinner spring material is used but made as multi-leaf, the fatiguing problem might be eliminated. .
I am conscious of the risk of having too weak a spring as it might not prevent the latch from creeping open in transit, subsequently dumping all the tools into the boot, with the ensuing surface damage. I would like to have an original spring to use for determining the pull force needed to open the latch, as I can then fiddle with home-made alternatives. I’ll keep experimenting as I need to finish them now that I have been fortunate to have the latches re-chromed to a very high standard.
Peter - Mk IV