Best practice - antenna cable exits at masthead

[RoyB]

I'm going to be installing some antenna and electrical cables in a Selden mast soon.

I'm curious what people think is the state of the art / best practice for managing the cable exits from the mast at the head. The cables will be run through the neat dual channel that Selden provides.

I've considered:

Smoothed elongated slots cut into the mast (like a smaller version of a halyard exit)

Rubber grommets in oversized holes

Cable glands threaded into the mast section

Cable gland threaded into the cast head fitting

Type N connector feed-throughs in the mast wall

Thanks in advance