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Philip, i took out the finderscope and there’s indeed a groove and a spring on the holder which fits into the groove. Though the scope still moves a bit on the slightest of touch and messes up the alignment. I’m posting the pictures below. Do you think the missing O ring you mentioned is the problem here? If so, could you pls point me to an online link or picture? thank you for your help.

Thank you everyone, you guys are absolutely brilliant. I opened the cover plate and there are indeed the tightening allen keys and adjusting screws underneath. Also, my collimation is actually little off, so have a long night ahead Thanks again for your quick help on this.

Hi Louis, I’ve not actually. I wasn’t aware that this is a back cover. I honestly thought thay these three screws are holding the primary mirror itself, is it not?

Hi, I recently bought a s/h Skywatcher 150/750 reflector which didn’t come with a user manual. I’ve noticed the focus is a little off on many objects so decided to overcome my fears and collimate it using a homemade collimating cap. However, I can’t seem to find the 6 screws needed for collimation as shown in various online guides. Can you pls help me understand this? also, my spotting scope gets misaligned with the slightest of a tap on it, and it’s a real PITA to fix it in dark. Have I positioned it correctly? thanks very much for your help :)

Thank you everyone for your quick responses on this. I am really grateful for All your insights and practical tips I finally managed to get the actual picture of the mount. Do you think it’s the same EQ3-2 mount? The seller is unsure about the models and doesn’t have any box/ manuals.

A friend's friend is selling an old SW 6" version with a 750mm focal length which is gathering dust in their garage. It appears to be a very old version as it comes in blue colour (reference photo below). Could you please help me with a couple of questions please: 1) Which mount do you think this is? 2) The version which I am getting doesn't come with motor visible here but it has the same OTA, this same mount, 2 eyepieces and tripod. The seller says it is hardly ever used. How much do you think I should pay for this tops? 3) Is this better than buying a brand new Skyquest 130p, which comes with an EQ2 mount and 5" diameter? 4) Since this will be my first purchase, is there anything i can check about the quality of the scope before buying?

That's a fair point mate. Yes, I will be doing an in person inspection before buying. Just looking at the price alone, I am tempted to buy a used version instead of a new one, which allows me to spend the remaining amount on accessories. Also, if you have to choose, would you go for Skywatcher 130p or the older version of Skywatcher 150x750 (blue tube)?

Hello everyone, After going through a lot of posts on SGL, I have decided Skywatcher 130p will be my first scope. However, I am on a tight budget and hence buying a used one for around £90, as there are plenty of them available in the used market. Considering this is my first scope and I am a complete noob when it comes to judging the quality, are there any things that I should look out for to spot a bad scope? Your thoughts and insights would be very useful, it'll also help if you have any checklists that you have used in the past. Thank you.