Sonotube - Unsanded Epoxy Sealed Edges - Focuser Hole

Here is a photo of the focuser opening - epoxy reinforced. The diameter of the opening is around 2 1/2" to allow free movement of the focuser traverse tube to penetrate the main tube with just enough clearance. The rectangular notch cutout to the right of the hole will allow passage of the JMI focuser's "rack tension traverse plate" to clear the opening.