#1
OK I'm getting a new guitar with an edge pro in a week or two. However the factory strings are .09s if I'm not mistaken. I play .10s though. Will I have to change something when I get the guitar before re-strining it? I've never had a double locking guitar before.
#2
You will have to tighten the spring claw in the back of the trem cavity, but you do this after you re-string it.
#3
Does that apply inversly to tuning? If i want to Detune the guitar to D or E flat, should i loosen the springs? (yes i'm a lovely thread-hijacker!)..
#4
Yes, just follow these simple steps, you also might need to check the intonation. On 2003 Edge Pro onwards, you dont have to cut the ball bearings.

Tuning Floyd Rose:
1) Loosen the locking nut
2) Set your fine tuners to middle position
3) Tune up your guitar to standard or whichever tunings u wish. "Cross-tuning" between strings if you want easier. Tune the low E string> A string> low E string again> D string> low E string>A string... and so forth. Keep repeating for all strings. To make it more easier, tune the low E generally a bit sharper or about half step sharper, so that you might not have to repeat crossing the strings again and again.
4) If the floating bridge comes out, loosen the tunings and then tighten the springs in the tremolo cavity at the back, if the bridge sinks, then vice-versa, until the bridge is parallel to the body.
5) Be patient
6) If you're happy with your tunings and your bridge is well centered, lock in the nut
7) Tune again using the fine tuners

Also some tips - You might want to have at least 3 springs and after following the tuning method above, tighten the 2 claw's screw for about 1/8th or 1/4th more. This is to prevent your floating bridge from getting stuck to the knife edges on the posts (action studs) after you bend notes. You can ignore this if your bridge/trem is reliable (e.g. Edge Pro, Edge, ZR, Lo-Pro Edge, Original Floyd Rose, Licenced Floyd Rose by Kahler/Schaller/Gotoh). But still you may face this problem even if your bridge is very good.

More info on tuning floyd roses - http://www.floydrose.com/originaltremolo.html
Info on changing strings - http://www.ultimate-guitar.com/columns/features/steal_this_video_re-stringing_guitar.html
Picture guide on how to perform the #4 step mentioned above - http://www.fretnotguitarrepair.com/floydrosetremolo.htm
http://www.jemsite.com/tech/1setup.htm#step1


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