I think the '70 R75/5 must be a holdover from the /2s. My '69 R69S has countersunk flathead screws. You're /6 has bolts. My /7 has allen head bolts. Being one of the first models after the /2s, seems likely that he would have screws.
And a small point...maybe I remembered this wrong... A bolt is a fastener that is held in place by a nut on the other end. A screw is a fastener that is held in place by its own threads. Are we talking about screws in this situation, just different heads?
From http://www.toolingu.com/definition-7...3252-bolt.html
bolt - An externally threaded, cylindrical fastener with a head at one end and a threaded blunt end at the other. Bolts are designed to fit into non-threaded holes to join parts and are assembled with a nut.
screw - An externally threaded, cylindrical fastener with a head and a threaded flat or pointed end opposite the head. Screws are designed either to fit into a threaded hole or form threads into material.




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