That is one reason I switch to an aluminum module like they used before they switched to the composite(plastic) ones. Not sure if you can still get them in aluminum, they were on the Martin website store at one time.
Aluminum f modules are no longer listed in their parts catalog. They may have a few laying around in sroage, but they are no longer in production. No reason for them. The molded ones have been used on various cams for many years with few problems. Yes, there will be isolated cases of failure, but they are too far in between to justify the expense of machining and storing aluminum mods.