Very true. It's also important that it is a machine screw so it has the flat end and will not try and screw into the wood. Assuming anything metric is probably a machine screw anyway but not 100% on that.
Having done this myself, I can tell you that you will need to break the seal from gasket between case and back section. Use hairdryer or heat gun on the aluminum backplate to loosen seal then removal should be very easy.
Call JL Audio. They told me how to remove the back on my F-113.
Basically, after you remove all the back panel screws you insert a slightly larger diameter and longer screw into one of the screw holes. This then will pop one of the corners out thus allowing you to pull out the rest of the back.
I can’t remember the size of the screw that I used that’s why I say call them for that info.
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