Meade ETX-60 Telescope Rear Port Cap

Had to make a rear port cap for my ETX-60. Threads are apparently 1-3/8 at 22 tpi, the iso tap tool in Tinkered came very close and the part threaded all the way first time. This is only 1 mm thick, the walls are 1.5 mm. The height is 7 mm so the inside depth is about a quarter inch. Location is the straight through rear port under the eyepiece on the ETX-60.

Other options are to remix with more thickness to the base, add a 38 mm disk to the bottom for whatever thickness you want and adjust y