a combinaton of both

make a pair of swedging plyers from a cheap soft metal needle nose plyers. clamp the plyer jaws in a vise and drill a hole near the tip. make the hole a bit smaller than the key hinge you want to shrink. polish the drilled hole with fine emery cloth to remove all traces of scratches. the more polished the better. with the key off and the steel in the key. squeeze the key hinge around the steel. even and lightly at first, till ya see how soft the key is. a key of harder brass will require more pressure. you can streatch the hinge by pull ing towards the edges as you swedge. you will need to true theends of the key hinge where it contacts the key posts after streatching. the novice tends to squeeze tthe hinge oval making the the steel bind. its easy to see, just squeeze it round again.

Thanks for all suggestions !! I have to do this with the dismounted key and then to assemble to see how it works or could I do it with the mounted key ?

There are many diferent methods of taking the play out of keys. "swedging" will reduce the diameter of the hinge tube as well as lengthen the tube. Making a pair of swedging pliers is not quite as simple as what one respondent suggested. In actuality you don't want to drill the hole in the plier smaller than the hinge tube diameter, you want it a bit larger than the tube diameter. I use to work for Erick Brand and here is how it was done. We used plier blanks that started off soft then were hardened, you can do the same thing by anealing a pairof needle nose pliers then drilling them with a cobalt or carbide twist drill of the appropriate size. Cut a piece of brass shim stock that is .020-.030 thick hold the shim stock in the pliers so that it holds the jaws of the plier open. clamp the pliers VERY tightly in a good drill press or milling machine vise. Drill through the pliers with a drill size that is slightly larger (.005-.010")than the diameter of your tubing. If you have a reamer that will help too. Polish the inside of the jaws with emery and tripoli compound. Re harden the pliers, polish again. In addition to removing play by swedging, you can also lengthen hinge tubes which requires silver soldering. You can also move posts on a sax by unsoldering and moving them over slightly, or if there are dents in the horn...Take the dents out! Regards, Matt

THANKS !!