Especially good if you have a pause of a couple of days in the middle of the operation.
I suspect Fender soldered their cans to the chassis because it's cheaper than this type of mounting. The mount costs money, as do the screws and nuts. Leo Fender was known to have watched costs meticulously - this mounting would have cost too much money for him!
I then just cut the actual capacitor off at the base. Use gloves to handle the capacitor. The paper and foil 'roll' has some sort of paste on it; I bet it's not good to handle it.
Tie the grounds together and run the positive leads through the base to their respective tabs.
The end result looks like the original.
You may have noticed this is the famous Mallory FP cap. Very common on mid 1950s through 1960s American electronics.