#1
so, i had the problem of the inclining bridge when you change string and gauge of strings, i kind of fix it, i managed to put the bridge back where its supposed to be, but the strings wont stay in tune, when i tune the lower ones, the higher strings come out of tune.

What should I do?
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#2
just keep trying to tune it. check your tuning. it happens to all of us sometimes and keep in mind that machine heads are sensitive. if you have a tremolo bar make sure your hand isn't pushing on the bridge(if you have a locking nut and are adjusting the fine tuners)