You may have some of these things...
1. Observing chair (adjustable height)
2. Telrad or Red dot finder (Telrad is easily stuck on to the tube)
3. Right Angle Correct Image finderscope (used in conjunction with the Telrad makes star hopping a little more fun)
4. Narrowband UHC filter for Nebula
5. Nice collimation tools and replacing any hex screws on the secondary or primary mirrors with Bob's Knobs
6. Eyepieces (maybe an 82° Explore Scientific 6.7mm for higher magnification)
7. DIY fan or flock the interior
8. Digital setting circles (Argo Navis etc.)
9. Plan more trips to a dark sky to use the scopet there then you'll probably feel less inclined to get any of the above except for the chair!
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