Registering Your Combination Kryptonite Support October 27, 2016 18:04 Updated Follow You can register your combination right on our website...quick and easy. Visit Key/Combo Registration.If you change your combination don't forget to contact us to update your combination in our system. Related articles Resetting Your Resettable Combination Lock KryptoFlex Combo Cable Factory Preset Did I register my number? Can you explain the On Line Registration Form? Can I call the Customer Support Team? Comments 1 comment Sort by Date Votes Garciasanmiguel April 16, 2013 03:57 Please be informed that the Kryptonite Lock has a serial number 501088 and the spare key has the serial number SS67504 R 3. Please be informed that the spare key does not enter in the keyhole and I have not forced it. Your help is appreciated. Thank you 0 Permalink Article is closed for comments.