I have a fat-tongued, now-palleted, fussy gelding who goes really well in a double jointed baucher. He tends to get a bit panicky in a solid mouthpiece, and a single joint is too harsh for him. I love the baucher because it holds the mouthpiece nice and stable for him, giving him some room for his tongue, as well as having a stable cheekpiece and a bit of help with steering as well.
I actually have a 5.5" (fits more like a 5.75 as it was a touch wide for my guy who is a true 5.5 mouth) french link baucher that I no longer use (replaced it with a Stubben lozenge link baucher. I prefer the feel I get with the lozenge link vs the flat french link) that I’d be happy to pass on to a COTHer in need. I had a COTHer help me out when I was in need of a specific type of girth, and I’d love to pay it forward