They are hit or miss. I bought and returned about 30 not kidding before I hit pay dirt. The prices are all over the place. Someone selling over $100USD if anyone bites is wiping the floor. These probably cost about $5USD wholesale. A custom cap they are not but if you get a good one they are fairly nice. The problem is that for every good one there are 500 ugly ones. The other issue is all of these sit very high if that bothers anyone. I do like the Koi Fish and have some. My problem is I cannot be patient to wait for group buys. That is why I was so happy with Cup Cables. She made me an incredible cable that was like $350 for $50 and had it to me in less than a week. I will take every chance to thank her. The reason she did it was because of an error on her website. Still, she really did not have to do that. Anyways If you are not looking for over the top quality there are some okay caps on Amazon, Etsy and Ebay. Nothing like what you folks are used to but they are not all horrible.
I am using a one of a kind keyboard typo left me and even compared to his Koyu it is much nicer. It is a 105 key and I weighed it at 38.6 pounds! It is solid steel plus an internal and external weight. He even had the switches custom made I guess. I cannot find reference to these switches anywhere. Honestly I miss my Grandpa.
Oh about R1 and R4 I just say it is for the top row. I do not mind the SA escape on an OEM set. Escape is so far away on this huge board. So it looks alright. There is no way to fix the height issue, the stem is not long enough.
I did ask a question that never got answered. maybe someone would answer it here. i guess I do not know how to use calipers. i have a high end Japanese set. I measure a cap and get say 1.65 minus the decimals. I measure it again in about the same spot and get 1.1 or 1.3 or whatever. Does it matter how deep you measure, or the angle? I am positive it is my technique. These are KAT caps so there is no way they are 1.1 anywhere. Except for the few Artisan keys. The switches have LED's and it has a black mirror plate. Against the white caps it looks very cool. I would trade it all for my Grandpa back though. I don't mean to be a buzzkill. It is what it is. If someone could tell me why I am messing up the calipers I would appreciate it.