I have just installed a new GSO (Guan Sheng Optical) dual speed low profile crayford focuser with a 10:1 ratio on my 12.5" Dicovery PDHQ Dob. The focuser really has a nice feel and finish, better than I had expected. The focuser and the 1.25" adapter both utilize compression rings which will save my eyepieces from set screw marks on the barrels. I ordered it through Agena Astro and it arrived in 2 days. They always treat their customers right. Installation was a snap, I only had to drill 2 mounting holes in the telescope tube and that's it. I bolted it on and re-collimated my scope. My heaviest eyepiece setup is 4 lbs. and this focuser lifts it with no problems at all which seems to be the concern of some folks but that sure seems unfounded by me. With the micro focus I have been able to squeeze out the finest details from Jupiter and other objects.
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