Power cords/cord hardware

[Rhodesplyr]

I was wondering if there's a particularly good source for power cords and mounting hardware.

The reason I ask is that when I removed the old two-wire power cord from the Thordarson PA amp I'm working on, I found that it had a cord input hole with a curved-in edges like a trumpet bell, 1/2" diameter. (No sharp edges) A regular Heyco strain relief won't fit it because the in-curved hole is too deep. The original cord had a molded rubber strain-relief that fit the hole. Of course, this was made in 1948...

I could drill it out to the next largest standard cord size (0.625 I think?), but I try to avoid drilling new holes when I can.

What do most people use when mounting a new power cord? I often find that things like this take me longer to figure out than the electronics, especially if I want to avoid having it look too "homemade."

Are SJO or SVT cords preferred?

Thanks!

[Cygnus X1]

I like IEC sockets where I can fit them.
You can get a cutting die to make the rectangular hole.

Same with using a die to cut a new hole for the 3 wire cord strain relief.

Cheapest, ugliest method is using a big rat-tail file to enlarge a hole.
Concerning the 1/2" metal grommet hole...I have secured the cord from the inside with either a knot or
a large ziptie.
Not the best solution!

[Gibsonman63]

IEC sockets are great on a new build, but I would never do it on a vintage amp.

Most of the online amp parts suppliers have the grommets and power cables. I ended up with a bunch of the detachable IEC power cables over the years. When I did my Blackface Fenders, I just cut the IEC end off. I found that the smaller guage ones worked best because they were closer to the original diameter. I was able to reused the original grommets, but I had to drill them out just a little.