Does anyone happen to know if it is possible to replace/repair any components on the Logitech G5 Laser mouse? I purrchased one "as is" on ebay and it needs to be repaired. The whole thing needs to be checked out but I also cannot find a replacement weight cartridge. Does anyone know where I may be able to find one of these? And if anyone knows of any ways of repairing this mouse I would be grateful if you shared these with me.