if you take an off the shelf cylinder, and drill holes in it, it looses its certification.

if you enlarge the already made holes, it may effect its certificate.

just how much work on a cylinder/ram is allowed before it looses its certificate?

maybe you should ask the RFL this, and if it turns out that a lot of rams are actually in breach of their original certification, then prototype rules can be suggested rather than ban the current machines?

just my suggestion to help?