2-inch to 2.156"x24tpi Male Thread Adapter (17667)

Description Adapters for 2-inch Focuser Drawtubes 2-inch O.D. Adapters to fit the TCF-S and other 2-inch focusers. Each of our 2-inch Drawtube adapters are machined to tight tolerances for a smooth, snug fit into the TCF-S and TCF-Si 2-inch focuser drawtubes. A dovetail cut directly matches the thumbscrews on the TCF-S for a secure fit.  By tightening the thumbscrews, the adapter is drawn tightly into the focuser's drawtube. These 2-inch drawtube adapters will usually fit very well into other manufacturer's focusers as well.   Contact Optec for any 2-inch drawtube adapter not listed here. #17666 - 2-inch to 3"x24tpi male  thread Adapter. The 2-inch to STL thread adapter was developed to easily adapt the SBIG and QSI cameras and filters wheels for the TCF-S focuser. By holding tight tolerances (+/- 0.003") Optec has achieved a slip-fit that is second-to-none.  When used with the TCF-S focuser, the #17667 with its  precision machined dovetail cut exactly matches the three thumbscrews on