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I had issues with my 6” f6 secondary and primary a while back , stars looked odd shaped on one side or flaired on one side
Did the following to resolve -
1/ Bought a 1.25 Cheshire , learnt how to use it on Astrobaby, it’s a must to use one when aligning your secondary
2/ Cut a oval piece of plastic out of a 2 litre milk bottle the same size and shape of your secondary , drilled three 5mm holes , placed it between the secondary holder and base , as the secondary screws after time gouge out or pit the base which creates a huge issue when adjusting. The plastic makes your adjusting very smooth and precise
3/ Replace primary springs with new custom springs with more length and tension ( Better Springs at Winston Hills Sydney) The primary mirror now is so easy to adjust and so precise
After doing the above items my 6” f6 is so easy to collimate now and so precise
Stars are correct shape with pin point diffraction spikes
My spider vanes we’re out a bit so used a small metal right angle to square them up 90 deg / 90 deg on the horizontal and vertical
Aligning your secondary is one of the most important part of collimating your telescope !!!
Hope the above helps
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