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I had my new springs made with similar ID and OD , slightly longer by 3mm but most importantly with a stronger compression rating
My old springs had weak compression and therefore collimation would be difficult to nail. Stronger springs give you more control over fine adjustment.
The new springs weren’t cheap but the difference was amazing and in hindsight I should have upgraded as soon as I bought the scope
I also cut out / fashioned / fitted a piece of plastic from a 2 Ltr milk container and placed it behind the secondary mirror mount / stalk so the 3 adjustment screws have a firm base to screw into rather than “pit” the alloy base. It also made a huge difference to the secondary mirror alignment. I found this little mod on a website demonstrating collimation.
Collimation rarely drifts in my scopes and I just do a quick check with a laser once in a while
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