Focusser 2
The next sequence shows the focus assembly removed from the scope, and taken apart.
Look carefully and you will see the location on the nylon washers used as bearings in the orig. focus assembly, they are hard to see in the first images, due to the grease used. As I cleaned up the assembly, they become much easier to see. The main focus knob is removed by undoing the two 3/32 grub screws, then UNSCREWING the silver knob from the brass 'nut' (It's not a nut in the normal sense, but it serves the same function)
The 'feel' and slop of the focus system is mainly determined by how hard the silver knob is screwed onto the nut. Once the desired 'feel' is obtained the two grub screws lock the knob into position. When the knob is then rotated, the entire assembly of the silver knob and the inner brass nut rotate inside the black housing. It is this action that drives the mirror in and out. The main knob on my assembly unscrewed easily by hand. I have seen one or two reports from people stating that they had to use quite some force to get the threads to unscrew.
If you do grip the end of the brass nut with some form of tool, be very very careful not to burr the edge of the brass, it's a soft metal and is easily damaged.
If you look at the fourth and sixth image, you can see the socket head screw that acts as a stop screwed into the end of the threaded rod. I found 4 nylon washers in my focus assembly, you can see them, (with more grease) on the last three images.
