To celebrate what would be the 51st anniversary of Orion Telescope, I converted my tired old XT8 Dobsonian into their luxury edition (as measured by Orion 2015 standards) by adding the classic control knob at the front. It's a $6 upgrade anybody can do.
youtu.be/IS3LHNds1kY
youtu.be
I Added Luxury to an Old Dobsonian Telescope (It's a Knob)
YouTube video by Astronomy Garage with Reflactor