Simple T2 to 1.25" adapter.
Thicker side: M42x0.75 thread (41.8mm)
Thinner side: 1.25 inch
Perfectly fits both my T2 adapter and my 8" SW telescope. Works well with my barlow.
Unfortunately my SW telescope's 1.25" adapter is too long to focus in my Olympus e520 DSLR. It's too far away, so I had to make something else to connect camera directly to 2" focus tube:
T2 to 2" adapter.
Bottom: M42x0.75 thread (41.8mm)
Top: 2" (50.25mm)
Thread is not perfect, but it works