Crayford Style Focuser for Astronomical Telescopes

I used this with a Takahashi μ-210. I removed the black adapter from the Takahashi eyepiece holder, removed the black ring at the base of the Forcuser, and then inserted the base of the Forcuser directly into the Takahashi and secured it with the three set screws. However, I was concerned that the metal set screws would scratch the telescope, so I purchased plastic screws instead and was able to secure it with those. I've only used it about 4-5 times, so it's practically new.