Just as a reference point, I bought my 3-foot acme threaded rod from Grainger for $17, and I still have 2 feet left.

Here's an important note!
The 3/4" nuts used with this tool are used with a 1-1/4" wrench. My 1-1/4" socket BARELY fit through the hole in the engine bay. So if you want to use something larger, beware, your socket won't fit!

The idea is to use a socket wrench from above through this hole for the welded nut, and then use an open end wrench through the spring coils on the free nut at the bottom.

__________________
'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo