[MrFixr55]

If the wiring and soldering is good, I am not opposed to J-hooking, especially if you are stuffing caps. Personally, J hooking is mandatory if you are going to stuff paper caps, as you can seal the hook inside the cap and it will look like you never changed them (or disturbed the wiring).

If dealing with decayed wiring, especially rubber, then you need to desolder at the sockets. Use the steps recommended by Rod and Morzh