I’ve made mainsprings for this lock, easy to do. Problem is the bridle and sear, they’re both usually misaligned and there is no integral pin to keep the bridle stationary, ironically this is an issue i see most commonly on Indian made locks.
To fix the the lock, I’ve welded up the bridle and added an integral pin and then aligned the bridle to the plate holes with a mill for near perfect alignment, the lock works great when corrected, very reliable lock however in its factory state, not good at all.