I it learnt from you Gary.....athwartships ????
I'd have to agree with Gary re the Losmandy guiderings. They truely are excellent guide rings.
If you were to go with Gary's idea of using the Tak Clam to adjust forward/aft location of the Tak then bolting a mounting saddle to the other end of the rail, getting a male/male dovetail will allow you to slide the 80 forward/aft without loosening the guide ring adjustment screws.