Internally baffled aluminum refractor tube with 120mm objective cell from a Synta 120mm f/8 scope. The tube is stripped of paint and in the white. The front tube threads have been tuned off on a lathe, same with internal threads of lens cell. Lens cell is now a slip over fit to tube with drilled and tapped holes for three set-screws to secure cell to tube (can be collimated with this setup). $50 for tube and cell plus shipping.