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Depending on the type of Lens Cell the refractor has, it can be collimated by using the 3 sets of push/pull screws located around the front lens cell. This type of collimation is normally done on a bench and you use a Cheshire Eyepiece to center the yellow and blue coloured rings, using the 45 degree cutout in the Cheshire Eyepiece, you shine a light into the cutout and the rings are superimposed onto the front lens, you then adjust the push/pull screws until the rings are centered.
Note, not all refractors have these push/pull screws as the manufacturers don't like people playing with them, any misadjustment can cause you a lot of work to get your collimation back.
Also, most refractors can tolerate a large amount of miscollimation and still provide a good image.
Hope this helps a little.
Cheers
JohnG
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