This article is based on my experience with fixing "dodgy" keys for a
CBM64, an A500 and an A4000.  The methods are the same for all
keyboards that have a plastic membrane under the keys:  and I believe
this is true of the A1200, though the cable connection to the membrane
is different.

Step by step instructions are given, including the tools and materials
needed. It's not difficult.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 5773   13778  41.9% -lh5- 1fe0 Apr  1  1997 KeyboardRepairs
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         1 file     5773   13778  41.9%            Apr  1  1997