How to run an extension cord through a tight space
There are many reasons to not use extension cord or plug strips for certain applications. But setting those aside and assuming you understand the ins and outs of proper extension cord applications....there is a sane way to deal with the situation of the "tight spot".

Assuming you purchase a reasonably decent extension cord such as:



Do not cut and try to splice back together the cord itself. Instead cut off the end of the cord right at the plug...



Now feed the cord through the "tight spot". Then provide a new end for the cable by attaching an appropriate replacement plug assembly.