I am a retired scientist and teacher who just took on a volunteer task to check out, clean, tune, maintain, and refurbish approximately 50 student stereo and compound scopes at my daughter’s high school. Most of the scopes are off warranty, and many are greater than 10 years old. Two compound scopes even had seized nosepieces. I quickly discovered that replacement parts for older scopes are difficult to find after contacting several microscope sources. However, when I contacted Boli-Optics I was pleasantly surprised that they enthusiastically wanted to help me. Mary Zhang sent my turret specs off to their factory and Boli-Optics was able to provide me in short order replicas of the two turrets. I have also ordered incidentals like dust covers and a set of pin wrenches. Everything was of high quality and reasonably priced. It has been a pleasure doing business with them and I would recommend them to any folks struggling to refurbish old scopes and to acquire new scopes. They have an extensive and attractive catalog and the staff are very professional and responsive.