These risers lift the Telrad off the telescope tube by 81mm, allowing a more comfortable viewing angle when mounted on a Dob.

Two must be printed per Telrad.

There are threaded holes for M4 bolts on either side of the risers, but you only need to put one bolt in each riser. Pick the side that is more easily accessible when mounted on your telescope. The second hole also serves as a backup if the threads get stripped out on one side.

I found it easier to put the risers on the Telrad first, then attach to the mounting plate on the telescope.