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Hello again, sorry for bumping an old thread. I just don't want to be that guy that doesn't follow up with the solution to the problem. I did the thing that vlaiv suggested and basically found out that my focuser is much longer than the old one. That means that I had to cut the tube short. Which I did, but it took me a while because I don't have enough space/tools to do it at home. I had to shorten the tube for about 2cm (0.8in) with the help of youtube video linked above. It's not a simple thing to do if you are more of an IT guy and less of a handy man, but I had some help. The new focuser looks a bit silly on this tiny tube (see attachement), but it makes focusing a million time easier. So thank you everyone for all your advice and help. I love this kind of communities. Regards, Jože

Bad news. I managed to catch a moment before the evening fog rolled in and tried your suggestion while watching the Moon. If I hold EP further away, I just start to see the cross from secondary mirror. The Moon doesn't get any clearer. I also found out that I got one 2“ adapter with the focuser and I tried to use it. It's the same - I just see the shadow of secondary mirror in the EP. It doesn't matter how much I rotate the focuser knob. It just doesn't focus at all. Is it possible I screwed up something else?

Great, thank you for the link. It's getting much clearer now. I didn't measure both focusers, but they did look similar in size so I didn't think about that. After your answer I checked with measuring tape and clearly they are not the same length.

Thank you, this was very fast. I have indeed not tried holding EP further away. And the new focuser is clearly shorter as the old one. I use a 2"->1,25" adapter but that probably doesn't add enough length to reach a focal point. Thanks so much. I will test it asap and I will let you know if you saved me.

Hello, I hope I'm not breaking any rules making a new topic right after registering. I've searched far and wide for a solution. Sadly it's for a problem which is totally my fault. So I came here in hope of finding someone who is smarter than me. So... I am quite new in this whole stargazing movement. I've bought a nice beginner scope (Skywatcher P150). After about a year I started to notice that the worst part of the scope is most certainly its plastic R&P focuser. Right then 've made a bad decision and bought Skywatcher Quattro 2" Crayford Newtonian Focuser (the one that comes on PDS version of Skywatcher). It took me a while (and a little help from grandfather-in-law) to make a bigger hole with the same center and to mount a new focuser. Now when I do a collimation with my laser collimator, the dot is centered very perfectly. It doesn't matter how deep the focuser tube is, the collimation is always great. Except I can't focus on anything when I try to look through the eyepiece. I picked an easy target (moon), but I can't focus it. It's just blurry as if there was no focuser at all. So I'm asking for your help. Did I miss something important? Did I just make quite an expensive mistake and destroyed my tube? I just have no idea where to look for a solution. Regards, Joze p.s. Sorry for my weird english. It's not my native language.