Davis amp model 106 questions

[Chain Smokin]

I hope this is the right spot to put this. If not plz let me know where to go.
I saw a post somewhere on this site about the amp and it had the schematics with it so I figured somebody might know what I'm trying to ask.
Ive got this lil amp here and saw a video of a guy that transformed it into a guitar amp. I'll hopefully be able to post the link.
He starts talking about it at around 10:51
Basically he states that after he switched it over to the 3 wire vs 2 wire he recommended doing it another way and I don't understand what he meant.
And if he makes sense on how he would recommend on doing differently I would love to know if it is a better idea and if so how to do it. It just didn't make sense to me.
Also I've read on a lot of threads that when you change to a 3 wire they usually have a death cap, so if there is one i would like to take that puppy out.
I hope these pictures show up.
If they don't plz let me know
if they do the picture of the guts is how far I've gotten.


 (

=10m51s)

[shooter]

The "death cap" would be on the primary side of the PT, schematic says you don't have one.

I didn't watch the video, I get bored easy 
I don't see a problem just bolting the ground lead on the power plug to the chassis
look here, pg 2.  NOTE:, your schematic shows elevated heaters, so don't add the 2 100ohmer's like shown in the link

[shooter]

forgot link 
http://el34world.com/Hoffman/files/Hoffman_5E3.pdf