I re-keyed my Givi Trekker 33 quite easily to my BMW key.
It's one of these:
Easy-ish to do. Open the case and remove the 2 screws at the back of the locking mechanism. The whole lot then pulls out to the front.
Undo the 10mm nut seen here. Remove the nut, washer and plastic part. Don't loose the spring and ball bearing. The lock can then be pushed out.
Remove all the waffers and little springs. Then prise the little lock barrel chrome cover off. Be careful as behind it lives a couple of springs and plastic key entrance cover. Remove them also.
This is what they look like:
To make the BMW key fit you need to make the slot in the lock a little larger. You can use a needle file, but it was cold in the garage so I used a 4mm drill bit to drill and 'file' it until the BMW key slotted straight in. Clean out any swarf or filings.
Refit the locks plastic entry bits and springs (a blob of grease holds them in place) and refit the chrome key entrance cover.
The first waffer is not spring loaded and just a hardened anti-drill/key guide. You will need to open this out so that the BMW key passes through it. Or you can just bin it, it will work fine without it.
Now the boring part of inserting waffers and springs until the BMW key goes smoothly into the lock and no waffer is forced to stick out from the barrel (with the key inserted). I managed to use all but 2 of the original waffers, but you could file them if you want to use the full set. Givi don't use grease, but I put a little on the springs. Make sure the wafers move freely without the key in.
Reassemble and test. Job done, no extra key for me
