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Ever messed up drilling a big hole. Easy to do. The SX350 uses a 16mm hole and if you mess it up you may have to replace the box mod. Just enlarge the hole to 19mm with a file or something has not got to be neat and glue this in the hole. has a 16mm opening that is perfect for the sx350 chip. Only sticks out 3mm. Has 2mm that goes in the hole. So it will make the mod look neater.