Sonotube - Unsanded with Sealed Edges-Back End

The back end of the tube was epoxy-treated like the front end. The epoxy also reinforced the primary mirror mount holes. To reduce tear out, I will either form a ring (to 1/8" thickness) of 1 1/2" to 1 7/8" fiberglass mesh as a end ring, or bend three 2" to 3" strips of 1/8" aluminum with 3/8" holes to support the primary mirror mount in the Sonotube®. This process will also be done for the four vane spider secondary mirror mount area of the tube, unless a better idea comes along.