I found a place that sells cylinder locks to replace the 751 locks that came with your rig. These are very well made and the cam is held on with nylock nuts and not screws. The new locks come with tube keys and also a master reset key. I change all my locks and on the bigger doors installed two. I ordered 10 locks and all were keyed the same, four keys and a reset key, shipping (two days) and all came to under $100. These guys are great and really are great to work with. They are Industrial Lock and Key and you can see what they have at the address below! Made in the USA!
www.mccsmiramar.com
www.mccsmiramar.com