Here’s what people who bought this item said: On April 20, 2023 hitch4200 wrote: “What a find! My Optiphot had free-wheeling condenser and fine-focus knobs. The replacements dropped right in and I couldn’t be happier. Highly recommended seller!” On March 22, 2023 nuhocker wrote: “Accurately represented, shipped promptly & well-packed. Standard Great Transaction! An A+” Exact Fit, Clean Design This condenser pinion shaft fits Nikon series 1 and 2 Labophot, Optiphot and Alphaphot microscopes. It’s carefully made to exact specifications, replacing original Nikon part number 2B264-001-1. * This one-piece stainless steel gear provides extended life over all plastics. * Super high-precision gear offers a smooth feel. * Before installing this pinion shaft, always ensure the condenser dovetail is lubricated with synthetic grease (eBay item number: 293727731239) and it moves freely. * Includes 30 minutes of free phone technical support. Please contact me for bulk orders or custom-made gears. Returns are only accepted on unused and undamaged gears. Any signs of installation and/or use will not be accepted. View My Refurbishing Nikon Alphaphot YS Microscope Video Click on the play button and the video will open in a new window Rebuilt Nikon Alphaphot YS Microscopes by David Berger Video will open in a new window Using the eBay App? Paste the link below into a browser window: [isdntekvideo]