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Tilt issues can caused by any number of reasons. The secondary isn't held securely in the spider, the spider assembly is too weak, too much load on the focuser, focuser isn't set square to the OTA, secondary isn't properly collimated, secondary's holder may be damaged & not hold collimation (a design & manufacturing flaw in mass produced Newts & a big flaw at that), just to name a few.
If you are only using a laser to collimate then there is the first source of your problems - a laser won't properly set your secondary mirror. The laser can be "telling" you that everything is kosher but the secondary can actually be way out even though the laser is coming back on itself. This is where a simple Cheshire eyepiece comes into its own. And depending on the laser you are using, the laser itself may need collimating too! The quality of fit of the laser in the focuser is another factor!
We need more info to be able to help you out. What scope you have, how you collimate (with what tools), the load you are putting on the focuser, the condition of the sec holder that the colli screws push on to. Once we know all of these then we can actually start working out where the source of the"tilt" is and possible solutions.
Alex
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