I have the loose ring kk ultra... lovely bit... my tb does lean on it a little, you probably wouldn't have this problem with the b ring though... Worked well on the youngster too, It feels nicer than a normal French link... and I think they prefer it.
Thanks. I use a Sprenger dynamic RS at the moment (same as a KK but curved and a bit thinner). He goes well in it but can sometimes be a bit strong so I use a Grackle (not done up tight at all) which is a good combination. His noseband rubs a bit, and I had thought on one of these as I could use a cavesson (I heard they are good for Horses who poke their tongues out like mine can with the RS as they hold the bit off the tongue). Plus, he can have a bit of high head carriage. I've used a similar bit before and most seem to like them.