Use Evo-Stik or similar adhesive - the kind you'd use to glue formica to a kitchen work surface with.
But in order for the glue to work, you will have to thoroughly clean off the old glue and degrease the areas on be glued on the keys. Degrease them thoroughly with alcohol such as isopropyl or methylated spirits as they won't harm the lacquer (don't use solvents such as acetone or nail polish remover as they can dissolve the lacquer).
Then thinly and evenly coat both the surfaces to be glued (the key and the cork) and wait for a few minutes until they're touch dry. Then stick the corks to the keys and apply some pressure to ensure a good bond, then trim the excess cork off and refit the key. If the venting is too low, trim the cork with a razor blade or carefully sand it down (avoiding scratching the body as you're doing so).
But in order for the glue to work, you will have to thoroughly clean off the old glue and degrease the areas on be glued on the keys. Degrease them thoroughly with alcohol such as isopropyl or methylated spirits as they won't harm the lacquer (don't use solvents such as acetone or nail polish remover as they can dissolve the lacquer).
Then thinly and evenly coat both the surfaces to be glued (the key and the cork) and wait for a few minutes until they're touch dry. Then stick the corks to the keys and apply some pressure to ensure a good bond, then trim the excess cork off and refit the key. If the venting is too low, trim the cork with a razor blade or carefully sand it down (avoiding scratching the body as you're doing so).
