Primary Leak
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Once you crack the bolts loose with the allen wrench the long way you can use the ball end (in the case of these ultra cool Bondhus drivers) to spin the bolts out.  The 1/4-20 size is the smallest size that is called a bolt.  When you go smaller, like a 12-24, they are called screws.  Just thought you'd want to know.
See, I can show off too.  I do have a set of 3/8 drive allen wrenches.  It's a little handier but not a tremendous speed advantage over a plain wrench.  I definitely use the wrench to assemble because it's shorter and bends a little to help judge the torque.  It's no fun to strip these out.  (Can you hear me meth freaks?  I didn't think so.)
In 1976 Harley had a lot of AMF (American Machine and Foundry) money to spend.  Most of it was wasted.  Some geek figured we really needed to be able to adjust the primary chain with the cover on so they added a kludge-fest arraignment with pivoting tensioners and springs and an external bolt and locknut.  I have never seen a primary chain stretch or wear out in 30 years.  The nylon tension blocks do wear out and the older design breaks off and jams in between the chain and the case and stuff but the chain itself never seems to go bad.  All this whizzy external adjustment has three primary (pun intended) implications: 1) more places for oil to leak.  2) greater misery in removing the primary cover. 3) no way to view the tensioned chain operate with the cover off.  After the leveraged buyout from AMF Harley had even more money so they perfected the bad design so it's designed on CAD workstations and made with the latest technology and assembled with SPC precision by Union guys who are actually sober.  It is still a bad design however.  I'll keep my '62, thanks.
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