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Here Look parts book V7II scroll down to Stornello and page 15https://www.guzzitek.org/parts_list/pb/750/V7-II_PL_Compil.pdf
..but I have no idea what bolt to look for. Is it #3?
Good grief! Page 385 Item eight. Loosen nuts top and bottom on the rod; rotate to adjust length; tighten nuts. Repair chapped hands and apologise to bike for swearing at it so much.(Can also be achieved by shifting either of the arms 4 & 9, by one spline notch. You may need to completely remove bolt 6, to do so. This might be slightly more accessible depending on where the Allen bolt head is positioned.)[Edits]Further detail.
You got it, or loosen the locknuts on each end of rod & turn the threaded rod between. Try the bolt in pic 2, one or 2 splines. You got itSorry bout thinking otherwise.
No, I'm pretty much half an idiot, so you weren't too far off. I can't get that bolt loose to turn it a tooth, so I'll use the rod to adjust it. Still learning! Thanks for everyone's help.
Put a pipe over the wrench or use a hammer & strike wrench to break loose the bolt It may have loctite on it.
You still have to get that allen out, how else will you grease the shaft through the frame. Replace it w/a hex. You did good.