Correct. RKC changed the profile for 7' 8' for black diamond k-55 and 9' for artemis. I wonder if they all have the same angle now though? RKC chime in?
It's not the angle/bevel the cushions are mounted on that makes them different. As I've explained in the past, I'll explain it once more. A+B=C A is the known sub-rail thickness from the surface of the slate to the top back of the cushions. C is the targeted known nose height based on 63 1/2% +/- 1% of the ball height. These figures were based on sub-rails being 1 11/16" thick, and with the K55 triangle profile Brunswick cushions.
OK, in comes modern manufacturers, with sub-rails anywhere from 1 1/2" to 1 3/4" thick.
B is the unknown part of the formula that can't have an answer until you first decide A and C, as the overall effect of B is the reaction of the balls and cushions.
If you have 2 sets of rails that have the exact same let's say 1 29/64" of an inch nose height, BUT one of the sets of rails has a 1 3/4" subrail thickness, and the second set of rails has a subrail thickness of 1 11/16" of an inch, what changed that makes the 2 tables play differently????
A 1/16" of an inch difference in the sub-rail thickness is all it takes to get rails to play like the Diamond red labels, or any table for that matter using a 1 3/4" subrail thickness.
The alignment of the body of the cushion behind the nose of the cushions WILL effect the playing reactions of those very same cushions on different rails with different specs.
The 63 1/2% +/- 1% of the l height ONLY applies to 1 11/16" thick sub-rails and ONLY with K55 profile cushions. Do ALL of you understand what I just posted or do I need to repeat myself???
If sub-rails are 1 5/8" or 1 9/16" or 1 1/2" thick, the nose height of 63 1/2% +/- no longer applies. And just so people understand, K66 cushions are a completely different triangle design when compared to the K55 cushion profile, and DO NOT WORK ON 1 11/16" THICK SUB-RAILS!!!!
So now to clarify the unknown answer of the C in the formula, until you can answer A+B, you have no idea what C is. All C does is give you the bevel to put A & B together.