Karl, the 13/16 is too large. I have a spark plug socket in that size also for some other vehicle I must have owned in the past. The 3/4 is okay, although a bit large. Being so anal, I want the right tool for the job. Kragen sells a 6-point 18mm, but they want almost $9 for it. Sears sells an 18mm deep 12-point socket that will work just fine for $3. I'll try the hose or rubber gas line insert to see how it works. I was going to install my new hex bar this evening, but (wouldn't you know it), I have lost or misplaced half my metric Allen wrenches. Have two sets of SAE Allens, but they are worthless in removing the Allen screws on the hex bar holders.
Hotdawg! Back to Sears in the morning for the correct tools, then back to the garage to change the hexer, pop up the idle jets to #55s and watch the old Spyder run like a scalded dog.....(fingers crossed). The manifold gaskets have been torqued down. Whoever designed the manifold nuts to be so close to the manifold should be given a free vacation at Pelican Bay. If the car fails to run properly, then new manifold gaskets....preceded, of course, by fava beans and a nice Chianti. If I keep up this insanity, I may just run out of GoJo, whereupon my wife will lock me out of the house. C'est la vie!