> I feel rather sheepish about asking this question, but that beats
> feeling really bad if I bust something.....   Attached is a photo of one
> of the connectors.   How do you remove it?

Big nut on the inside:

https://www.homedepot.com/p/Halex-1-2-in-90-Degree-Flexible-Metal-Conduit-FMC-Connector-91101/100155034

You can tap on the nut tits with a hammer and flat-blade screwdriver to
loosen it, or, they make pliers:

https://www.toolsource.com/pliers-c-194_238_785/lock-nut-pliers-812-in-p-105858.html

Tools for these things are usually at Home Depot, Lowe's, et cetera.

Looks like your supply was modded with a plate, held with the four
screws, then a hole made for the elbow.

The elbow itself is nothing, don't feel bad if you have to cut/grind it
off, but it looks like an older steel casting, so may be difficult if
you go that route.  I wonder if the clamp screws were cut short to
prevent hitting the case?  I usually take off 1/8-1/4".

Kurt