Bringing a '74 back up to her intended glory.

[Bmachine]

So here is a quick little one that was first mentioned by another forum member (in the UK IIRC) whose name I have sadly forgotten. But all credit goes to him for this one.

I found it! The originator of this idea was @Rek

 

[autokunst]

Correct. Round cross section. Size is labeled here as 1/4 inch. Matches actual measurement pretty good at 6.3 mm

View attachment 199911

Also commonly referred to as "backer rod". Brilliant idea.