[RAJAH235]

Here are a few for you to browse thru >
http://www.andysshotglass.com/Collimating.html < video
Why you need 'Offset'! >
http://www.skyandtelescope.com/howto/diy/3306996.html
& here >
http://web.telia.com/~u41105032/kolli/kolli.html
finally >
http://www.fpi-protostar.com/bgreer/collim.htm
HTH L.