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a few things on cap replacement.
Can caps of that era are often fine, no reason to automatically replace unless diagnosis indicates a problem. As you have found out its not easy to remove without damage to cap. the same goes for the film type caps, most will be fine.
Diagnosis is the key.
If a can type needs to be replaced the best approach IMHO is to cut the can off at the shoulder (like you did) BUT do it in place, do not remove the can.
I use a dremel bone saw (my words) to do the cutting. Most caps can be reached with this reciprocating saw. These are often used for cutting door trim when installing flooring.
cutting the can off leaves the base and all the wiring (which often is extensive and may have parts like resistors and small caps attached to the pins) untouched. Leaving the lead dress alone makes it much easier for the next guy if nothing else.
Buy the new skinny caps from mouser, they fit much better the foot print of the base.
using a micro drill bit simply drill holes from the bottom of the base close to the remaining terminals and grounds, then install from the top the skinny caps, no need for extention wires/tape/hot glue or any thing else, the fit right in the foot print.
If you feel the need to replace the outer can, just use some alum duct tap about 3/8 wide to reattach the can.
with this method I can do a 4 section can from start to finish in about 20min.
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