Hi CN members,
I got my first scope, an 8' GSO Dob after waiting for it about two months.
I have been able to assemble it, but have come unstuck at the altitude bearing set-up. My knobs keep coming off the shafts, and even when fixed as best as I can, the optical tube doesn't fit snugly or easily into its U-shaped slots in the base.
I had to open the knobs, because the knurled knob wasn't working well. Inside was a ball bearing between two washers and a plastic ring. I have fixed it so the plastic ring is first on the knob, such that the screw of the black knurled knob presses on it to create tension. The washers and bearings are behind.
I can't understand how the knob is supposed to hold on to the shaft and provide differential tension to the tube. In the photos I have attached, you will see that the knob comes off after applying pulling it with little pressure. I am sure that shouldn't happen, and as I said, it's not fitting into the slots easily.
Can you please help? How do I assemble the knob and / or the altitude tension systme into the tube? Here is a link for the scope is https://tejraj.com/g...-telescope.html . I have also attached some imperfect photos; I do not want to open the knob again until I know what I am doing.