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Remove the complete focuser pinion assembly by undoing the round nut and the two screws under it.
Remove the focuser lock knob from above.
Then using your Allen key adjust the two setscrews that apply pressure to the glide strip evenly on both the front and back of the glide strip until the draw tube moves smoothly through its full length, but without any lateral movement. If the movement gets tighter at either end you have too much pressure at that end and the glide strip is not pressing evenly allowing lateral or up down movement.
Then reinstall the pinion and the brass carrier and snug down the two screws only until there is no backlash as you focus in/out, not too tight or it will become impossible to move smoothly.
Replace the cover plate and round nut....
Replace the draw tube lock knob on top and make sure the little brass disc is there.
When collimating the MT160 for imaging (or for visual use) extend the draw tube to the position where it would be if your camera is attached and focused. Then lock the draw tube using the knob on top before collimating.
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