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I've been known to hang a little bag with ball sinkers in it , ball sinkes , from the tube to tune the balance if I add a heavy bit of kit to the focusor , keep adding sinkers til the tube is pretty much balanced - and cheap as chips .... everyone has fishing gear and sinkers.
If the tube is balanced , and you know the mass of the added gear , it's easy to calculate how much mass to add on the over side of the centre of balance to get very close to balance again.
mass1 x length1 = balance x length2 , where length1 is the distance from the pivot point (centre of balance) for added mass1 , and balance is the mass required at the hanging point to rebalance the OTA.
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