Originally Posted by Ivan
You could also try a double spring trick where you buy a spring that has a similar width and one with a smaller width and put the smaller width one in the thicker one.
I had ~70F weather today (this is Texas in the winter) and I had just bought a spring kit at Lowes. So, I tried the double-spring trick out today to see if I could improve velocity.
No improvement. Actually, the FPS was significantly lower, never going higher than 150.
I guess the valve must have something wrong with it? It's the only thing I haven't mucked with.
Looks like I have a barely functional antique. I was hoping to hunt for electros with it... oh well.