Just replaced my switches with the Bosch replacements. It didn't have to file the hole too much to get them to fit, mainly the corners on the top and bottom of each hole. I used a small triangle shaped file and only used a pushing (inward) motion to enlarge the corners. It took all of ten minutes to fit the switches. I read somewhere that the switches can be rebuilt but I tried very carefully to take mine apart but the thirty year old plastic more or less exploded with contacts and springs going everywhere. I'm sure someone will chime in with other options...good luck....... Pappy
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