To repair (and fixe) the ON/OFF button cap, on the Garmin Oregon 450 or 550 

Waterproof / no glue 
   Short Installation instruction sent with the button.
   Full installation video: 3DPS-FR Oregon 450 550 Button KIT Installation - YouTube
 
No NEW back covers available - Most of the spare parts available are second hand and will get damaged quickly (old rubber).

This button kit is an easy and working solution done by silicone casting.

   Small block in touch with the microswitch is resin printed.
   This button cap, done in silicone is very efficient, waterproof and pleasant to use.
   No glue needed

"3DProtoService Website : Click here"

UPIN Emballages Ménagers FR326826_01WVEO
UPIN Papiers FR326826_03UKX

Important Note:-
Opening your device requires a minimum of technical skill; please read or view the installation documents (fully ;-)) before proceeding with the installation. If in doubt, get help from a competent person. 3Dprtoservice cannot be held responsible for any damage that occurs during your repair process. Do not hesitate to contact us for more information