Twistlock is the best new ‘gadget’ for amateur astronomers! Do what I did and make all your ‘scopes and accessories twistlock. This diagonal is so much cheaper than the others you MUST be thinking it is some how cheap and nasty. Forget it, this is as good as you can get ANYWHERE, no bull. Astroshop.eu are not paying me to say this, great and fast service. Thank you and Happy New Year.