a little give at the joint


Lifting the bike by the seat post on my 2013 Jumper I noticed a minor "give" at one of the many joints in the back of the bike. It is EVER so light making it hard to determine were it could or may be loose. Im thinking its the lower joint above the pedal crank. Should there be a little give of should these be torqued to a certain tightness? Not sure what type of "bolt" (4 pin) this is, light passes thru to the other end. My guess is the tool needed would look like the one used to tighten a watch backing..
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