don't know about yours, but will have a go if you like ;-)
fwiw, the etrex has a rubber seal/grip. under that are two "sellotape" seals which also retain the buttons so remove with care! the split shell is pressed together and partly welded. the fun bit was pressing the clips in enough to release the two halves having cut the weld. don't suppose the 12XL is the same, though!
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