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I am shocked that most of the above didn't actually read the OP's post. The answers are at best wrong. It isn't a Newtonian reflector, but is a 152mm refractor.
From what I have read, for more than two lens surfaces it is impossible to collimate a refractor without a very expensive optical test bench.
OP, I strongly recommend not touching this unless you need an excuse to buy a new telescope... :-)
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