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there is a tutorial somewhere for that.i THINK you just basicallly desolder all the contacts, then apply the exact same amout of solder to each square making sure they are all even. look for the tut first tho.
if you havent desoldered them then dont, its kinda pointless and just causes more work for you, i desoldered all of them and wish i hadnt
The same thing happened to me once , not to worry though, the contact pad is easy to get back in place. It doesn't take much solder to hold down the pads, so reflowing what is already there should be enough. You will need to apply flux to the underside of the contact pad and then pin it in place by holding it down with tweezers or the tip of an exacto knife. Then briefly heat the top of the pad with the iron to flow the solder underneath, and continue to keep the pad pinned in place as you pull the iron away. After a few seconds the solder will harden, and you can release the pressure, leaving your contact pad secured. Also, make sure to clean any excess solder from your iron tip before you do this, otherwise it might leave a blob of solder on the top of the pad, which will disrupt its contact with the analog nub.