I needed an adapter for a 3/4" and a 1/2" EMT connection using the standard "T." I searched around the garage and found a 5/8" insulated (inexpensive) pipe clamp. It fit snug around the 1/2" EMT conduit but the holes would not line up with the T holes using the standard bolt. I swapped out the bolt with a 1/4 x 20 screw and nut. I loose fit the clamp over the 1/2" EMT and sandwiched the T over it. I was able to line up the 1/4" screw through all the holes and tighten everything with the nut. The clamp metal is soft and filled the gap. Tight non-slip adapter. Here are some pics.
