I have a bad and good CRT. I want to swap out BAD CRT with the
(known compatible) good one.

The CRT's HV wires have a special plug/jack into the HV
multiplier (flyback) so there is no flaky splicing to worry with.

The good CRT has (too) short HV wire. The wire does not reach the
HV multiplier (flyback).

I was told that i can carefully cut under silicon blob where HV
wire attaches to CRT and unsolder wire then solder the long one
in place ?yes/no? Then re-cover with silicon.
Let silcon dry/cure (**** completely ****) !!!

Questions :
0. Is this a feasible repair ?
1. What silicon do i buy (from local hardware?) ? is that special
silicon ?
2. Good CRT has 2" copper tape over the silicon blob / HV wire.
a. Do i need to replace this tape ?
b. can i use aluminum tape like for duct work ?
that is the real Aluminum tape with just sticky stuff
(no foam /vinyl/etc)
c. How can i get old piece copper tape to stick back ?
d. Any alternatives to the copper tape ?
3. Any special cleaning or surface prep needed to do this repair?

thanks for any help,
robb