I've used the electrical tape method as well. If it ever needs to be removed, it can be a sticky mess. Try some heat shrink.
Loose fitting power cord.
The power cord (Morrow) to my amp (Benchmark AHB2) is loose fitting. It keeps falling out with the slightest movement.
Two questions.
Will that affect the ultimate SQ?
Is there any way to fix the problem short of getting a new cord?