Sorry I missed your comment re collimation. I was hoping as it's only an f4 that mightn't be necessary
Seriously, haven't even checked it yet, but over the years while building my house/obs, I collected a war chest for that task, including Cheshire, good collimated laser, 2" Barlow, Catseye Collimator set and a dark sky full of stars. I plan on doing initial collimation with the scope at 45 degrees for better eyesight convenience. I can then check using the laser+Barlow if it holds collimation at other angles. News at 11.
I just finished remounting the OTA to the newly polar aligned CEM and rebalancing, so rechecked the mechanics of the secondary mounting to OTA at the same time. It has four 8mm rods connecting the front and rear rings, plus the eight bolts attaching the spider to the front ring plus the 10mm thick focuser mounting plate that bolts to both front and rear secondary rings.
Unless adding more 8mm rods, which would require some relatively precise drilling of attachment holes on the front and rear rings, do you have any other ideas on how to further beef up the secondary section if needed?