itmo

The problem is that i do not have a 40mm extension,except the one where the inner diameter is under 2" =) I need a 40mm optical length aluminium tube with M54x1 thread on both ends. I already asked a friend's friend (a metal shop owner..) if he is able to fabricate one for decent price.

I am focusing for visual observation. Problem is that the standard 2" adapter would provide this extra 40mm but i cannot use it because the inner diameter of the nose of the tube is a bit below 2" , which leads to my barlows and filters hitting it. The skywatcher focuser is designed to be too short, and you need to use a 1.25" adapter or a 2" adapter to reach visual focus. This makes focusing cameras etc. easier since you can just remove the adapters. I just hate those adapters with thumb screws so I have a 2" to 1.25" compression ring adapter with 2" filter threads , and a m54->2" adapter for the focuser. What I now need to get the perfect solution is the 40mm focuser extension M54 to M54 so I can move the M54 -> 2" adapter a bit outwards so it is in the middle of the focuser travel. This way I will have a nice 2" tube with no obstructions which i can drop down to 1.25" with a single adapter. This will also give me the possibility to screw 2" filters into the 2" -> 1.25" adapter so I can use my 1.25" eyepieces and barlows without having to constantly move the filter.

yes there are multiple adapters with compression rings. for example one which replaces taht one seen in the picture. The problem then becomes focuser travel. Atleast for me. I am in search of a 40mm extension to the focuser tube with M54x1 threads on both ends to bring stuff to focus.