Originally Posted by shred
Won't the dingle arm need to reciprocate to provide the proper sinusoidal depleneration?
I don't think so, it's very difficult to mechanicalise sinusoidal reciprocation especially when you must consider the variation in depleneration which if my understanding is correct should remain constant. I think that the thread which holds the dingle arm will be strong enough and this topic together with the arm will remain gyroscopically fixed to true north effectively preventing reciprocation other than a further reply.
P.S. For further clarification reference should be made to "Bob's Glossary of Useless Knowledge." Of course you will require clearance from the relevant authorities before this document is accessible as it contains large amounts of sensitive as well as de-sensitising material.