"N_Cook" wrote in message
...
2 of the keys are sticking, because the plastic has warped with time or
temperature. Instead of internal dimension of 18.7mm the underside open
width is now about 18.3mm where it abuts the static pillar and rubs
against
it. Any recognised safe method of locally heating or something that will
accurately realign the plastic and retain reformed shape? the throw on one
side is likely different to the other side so needs taking into account.




I have tried heating deformed keys with a hot air gun, and found it very
difficult. If you are very careful you can just about pull things into a
different shape if it is fouling something, but I found heating of a large
area often reults in the plastic shrinking and the key becoming too short to
fit/work at all. Different plastics may have different properties though,
these were old Roland keys no longer available.

Also there seems to be a fine tolerance between getting the plastic pliable
enough to remould, and so pliable it runs into a goo, which you have no hope
of moulding back to shape. A temperature controlled oven is probably your
best bet,k and you will need a lot of practice on something disposible
first.



Gareth.