I am looking to stop-tail my bigsby, as I never use it and I'm looking for increased tuning stability.

My most recent thought on this is to simply pull the spring out, which would keep the vibrato arm pulled down with the string tension and eliminate any wobble.

The only potential problem I can see is that if I were to break a string (which I haven't in years) then it would change the tension, which could potentially detune the guitar... But thats not a big risk.

Are there any other problems that I'm not seeing? Should that work?
Just change out the tailpiece for a trapeze style. Solid as a rock.
"Your sound is in your hands as much as anything. It's the way you pick, and the way you hold the guitar, more than it is the amp or the guitar you use." -- Stevie Ray Vaughan

"Anybody can play. The note is only 20 percent. The attitude of the motherfucker who plays it is 80 percent." -- Miles Davis

Guthrie on tone: https://www.youtube.com/watch?v=zmohdG9lLqY