Bahtinov Mask for Sky-Watcher EXPLORER-130 Telescope

A Bahtinov mask (https://en.wikipedia.org/wiki/Bahtinov_mask) to focus your telescope.

The mask pattern was made with https://satakagi.github.io/tribahtinovWebApps/Bahtinov.html , and the model in Blender. The outer diameter is 166 mm. There isn't anything to attach it firmly, just plop it on. I printed it in ABS, but anything will probably do.