Hi there! After finding my old PRT-500 in a drawer I took it to a shop to replace the battery. They messed it up, the watch displayed "open" the whole time and the light was on the whole time... returning home I did some searching in the internet and found some solutions - here in the forums ;)...

One of my springs shot into next year and I need another one. I checked Casio USA online and found none. I know there have been other threads about this but doing a search returns too many unrelated results.