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Bunnings has 1m lengths of PVC pipe in 80mm and 90mm diams. That would make a nice tube, albeit heavier than the postal tube idea. I like things to be light to make balancing easier.
You could try a 'wanted' ad in the accessories forum for a spare focuser. I am sure lots of people have old ones lying around. In many cases people have upgraded cheap stock focusers for aftermarket ones. The cheap stock ones are fine for finders. Or maybe cobble together a homemade one with the helical pipe fittings you can find at Bunnings?
Phil
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