Couv, I don't see another spring in my manuals, but I DO see what is either a nub or the tip of a tiny spring on the rear of that piston in the manual picture. I just could not remember if I had a tiny spring inside the safety piston, so I took the picture I had of the innards of my touch-control and 'blew' it up to look at that #20 safety piston...
...but I STILL can't see if that's a spring peeking out, or a solid nub on the rearward end of the piston (rearward being 'down' in the pic and rearward on the tractor). You also said "it is small enough to fit inside # 20 safety valve piston". So I would say that if your safety piston does NOT have a nub, and your mystery spring fits in there, then you have a match.
I did NOT have a spring that came out from that bore AFTER the piston came out, nor do I see one in the manuals.
BTW, when I placed my pieces on the table, I kept them properly oriented as to how they came out, so orient your piston as it is in the picture when you put it back in.
You're throwing a curve ball when you say 'the #20 safety piston pushes against a ball". The only ball I remember is in the next bore under.
BTW, if you want to remove the #26 Pressure Regulator Valve Seat, get one of these sockets like in the picture. I forget it's particular name, but I got it at NAPA.
Hope all this was clear! If not, or you need any other pictures, ask again.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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