2inch Diy Newton-reflective Focuser Full Metal No-rack 150/203/254mm Reflective Telescope Manual Focus W 1.25inch Adapter - Double Helical Focuser - AliExpress
Homage to Homemade Crayford Focusers - ATM, Optics and DIY Forum - Cloudy Nights
2inch Diy Refractive Focuser With Rack Full Metal Refractive Astronomical Telescope Focuser With 2inch To 1.25inch Adapter - Double Helical Focuser - AliExpress