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like crap there isn't!
the bolt isn't cast into the mirror its glued in, Glue contracts!
where you bolt it unless that hole is perfect then youll pull in the middle it takes soo little pressure you would go wtf.... Im not saying that it is 100% definate but yeah have you actually relieved the mirror aka, taken it off that primary yet and re tensioned the central bolt?
Mine was due to my collimation screws slightly warping the mirror cell and touching the rubber stops that i had spaced with a tissue so they wernt touching but after they where It took me 6 months to realise this.......
It cant be the spider vanes being out of alignment as that throws a totally different star diffraction spike.
It could be the secondary mirror not being flat or being pinched as well if you have a spare secondary mirror i would suggest you give it a try! When hunting these things down remove 1 part at a time and replace it with something that is known to work as it should. you will quickly find the culprit part.
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