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Oz, I am guessing that the secondary mirror of you Heritage scope isn't quite centered either in the focuser too? Such modest little scopes can be poorly put together just to save a few bucks. Some even skimp on screws, using a shorter one instead of the correct length if it means cents being saved, and to hell with the customer.
I would suggest you try to remove the secondary mirror, that is, remove it by removing the stalk from the tube, and have a closer look at the mechanism that holds the secondary assembly together. It will give you a better understanding of what could be going on. The solution could be a very simple one. If not, then you will be able to give us better info and take a couple of pictures. Sorry to say, but we are working rather blind here to give you the right information. I can't even verify if what you were told at Bunnings is correct as the problem isn't pinned down properly. Pretty much what Malcom has also said.
Alex.
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