Secure compartment locks — Can cams be replaced?


By Chris Dougherty

Chris Dougherty is a certified RV technician. Here is a letter he received from a reader while he was serving as’s technical editor.

Dear Chris,
cam lockI viewed the RV Doctor’s video on “combination compartment locks.” Most locks come with a “flat” as well as an “offset” cam to hold the door shut. The combination locks that I looked at previously showed the locks with only a “flat cam.” Is the flat cam permanently attached to the lock or can a screw be removed to exchange the different “offset” cams? (From the locks that I currently have and would be replacing as I need the offset cam.) Thanks. —Jerry

Dear Jerry,
The product you are referring to is the Combi-Cam lock and, yes, the cam can be replaced, as it is attached with a screw. The lock comes complete with two straight cams and an offset cam in the box. That said, I am not certain if the cam attachment dimensions are the same as with standard cam locks, but it would be worth a try, if one of the included ones won’t work. If they were not to work, the company offers a number of accessories, including cams for various applications. They can be found at or on Amazon.


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Dan Promen
Dan Promen

I’d give a bit of WD40 a try. It may seep into the tight spots a bit better. Then I’d follow up with graphite once it has broken loose.

Chuck Dunn
Chuck Dunn

I would like to know how to open a basement door the the key won’t work with any more or very seldom. I have tried Graphic.