Hi,
Here is a very good 2" mirror diagonal for sale. It comes with my Burgess 1278. It uses compression ring and it includes a 1.25"- 2" adaptor, which also uses compression rings.
I already have a 2" dielectric diagonal so I am putting this one for sale. I have tested it, and I see almost no difference between this diagonal and the 2" dielectric one. Mirror is clean.
Overall, very good condition. Comes with both end caps. No box though.
2" diagonal with 1.25"-2" adaptor. All for $60.