Hi all. So few weeks ago I did a post asking about diffraction spikes for my Rasa 8. So after some few helpful tips I decided to have a go at it. But the diffraction spikes on the star Arcturus is not perfect and I'm not sure why. Any advice is appreciated. I'm going to attach 2 images.
Diffracton Spikes Topic 2
I used fishing line across my aluminium dew shield 
The centre spike here is way off and im not sure why 
The centre spike here is way off and im not sure why 
The cross is the spikes created by the fishing line.
That other spike is something created by your RASA. Probably the camera cords.
Rotate the fishing line spike mask until you find where you like it. That's all.
That other spike is something created by your RASA. Probably the camera cords.
Rotate the fishing line spike mask until you find where you like it. That's all.
Yup, camera cords. Seen this before