First of all, I bought a new storage box that came without locks. The latches have holes with little flanges inside so that when you insert a correctly assembled cylinder, will allow the lock to be rotated and locked into place. One must insert the key in the lock cylinder to have enough leverage to rotate the cylinder into place. Keep in mind you will only want to drill into the cylinder itself otherwise you may destroy the plastic flanges that retain the cylinder. You essentially will destroy the cylinder by drilling it out. Mine came out in little pieces that I carefully removed. The cylinders are plastic with aluminum pieces that are installed with tiny springs. On my new cylinders, one of the aluminum pieces came as a black painted piece with its own spring this went in the very front ( where the key is inserted) This may be the piece that locks into the flanges. My incorrectly assembled cylinder was put at the very back. I could not get the cylinder to rotate fully in the latch but I also could not get it to release to get it out. That's why I ended up drilling it out. The lock cylinders are cheap, the storage box is expensive which is why I say carefully drill out the cylinder. This process is not hard to do but I say, you are on your own if it messes up your storage box. Just be carefull using the smallest drill bit(one smaller than the diameter of the cylinder) and go slowly. Good luckHmmm. Interesting.
How do the cylinders stay in then?