More Mast Tabernacle Questions

I have started the reconditioning of my mast. I will be replacing the spreaders, forestay, shrouds and adding a tabernacle. (and replacing all the non-stainless bolts and screws used by the previous owner with stainless pins, bolts and nuts
)
As I mentioned in a previous post this is an older mast that had been tabernacled at one time. But then someone re-sleeved it back into a single piece. They riveted a sleeve around both the top and bottom sections.
I removed the sleeve today and also found that it has some sort of insert installed. I guess to give it strength.
So here is my question. Do I need any type of re-enforcing when I install the tabernacle?
I am going to use the tabernacle from DR Marine. I assumed I would simply be able to rivet this tabernacle to each section. But now after seeing this metal insert I question whether or not I will need additional reinforcement.
If anyone else has installed a tabernacle? I would like to hear about how you went about this and any other advice you may have in this regard.
Thanks

As I mentioned in a previous post this is an older mast that had been tabernacled at one time. But then someone re-sleeved it back into a single piece. They riveted a sleeve around both the top and bottom sections.
I removed the sleeve today and also found that it has some sort of insert installed. I guess to give it strength.
So here is my question. Do I need any type of re-enforcing when I install the tabernacle?
I am going to use the tabernacle from DR Marine. I assumed I would simply be able to rivet this tabernacle to each section. But now after seeing this metal insert I question whether or not I will need additional reinforcement.
If anyone else has installed a tabernacle? I would like to hear about how you went about this and any other advice you may have in this regard.
Thanks