I use Fager bits with my double bridle, and I have been using them for at least 3 years.
Be prepared for a novel.
Back story, Bingo the first horse I used Fager bits with a double bridle was an elderly QH who was horribly conformed for fine riding, he had a low set neck, he was croup high, at 14 hands his throatlatch was thicker both up and down and side to side than that of a much larger draft horse stallion, and he was assigned to me as a lesson horse because he had everybody else’s number (balking, backing up large distances, loved the gate, defiant, and did not see any reason why he should ever obey his rider.)
I started off with a snaffle and finally got him to realize that I was not going to torture him at all. He ended up being having a rather soft mouth once he relaxed. My riding teacher got bored watching me ride him and I ended up on another horse for a few months. When that ended I asked for Bingo back, much to my riding teacher’s relief because he would still take advantage of beginners. I asked her permission to use a double bridle since Bingo had a rather long smile and had plenty of room in his mouth for two bits. I started him off with a 4 3/4" stainless steel Cambridge mouth Weymouth curb and a 5" three piece lozenge stainless steel bradoon, what every equitation book I have recommended.
Then I discovered Fager bits and my riding teacher was willing for me to try the titanium bits. I started off with the 125mm Fager Victoria mullen mouth curb (no longer made) and a 130mm Fager Madeleine double jointed bradoon. Everything went fine, Bingo LIKED the titanium bits, his mouth softened up even further and I had no problems until I got inspired to try the 135mm Fager Bianca three piece snaffle with a center roller titanium snaffle with regular sized rings. Bingo was pretty good but he obviously was not totally comfortable. I e-mailed Fager and the lady told me that after a lot of experimentation they now advocate that the curb bit be wider than the bradoon so that the curb bit would not interfere with the action of the bradoon. I had already bought a 135mm Fager Victoria Weymouth curb, I switched and the problems disappeared. My riding teacher was very pleased with Bingo’s improvement.
Well Bingo died (he was in his late twenties) and my next lesson horse was MJ, a QH with a very short “smile.” Before I would not have put him in a double bridle because his mouth did not have much room, but with the wider Weymouth curb I did not have any of the anticipated problems. I have been riding MJ with a double bridle for over a year with the Weymouth curb wider than the bradoon, he likes it and my riding teacher told me that she does NOT want me to switch back to just a snaffle bit (everybody else rides him in a snaffle.) I ride another horse at another stable, and her owner also lets me ride her horse with the double bridle Fager bits with the Weymouth wider than the bradoon, and this lady also told me she does not want me to go back to just the snaffle.
When the Fager Alice three piece with a roller in the center titanium bradoon (basically the Fager Bianca with bradoon sized rings) came out I switched from the Fager three piece Madeleine titanium bradoon to both horses’ enthusiastic approval, they LIKE the little roller in the center.
I should have bought at least two more of the Fager Victoria curb bits because WITH MY HANDS (I have MS, hand tremor and I often cannot tell where my hands are) these horses do not like me using the other Fager Weymouths I tried. The Fager Elisabeth was sort of OK but both the horses refused to relax fully into the bit, the Fager Felicia Weymouth was not good at all with my hands. I’ve ridden the mare I tried the Felicia on for over 10 years with maybe 10 different bits and the Felicia was the only one that the mare begged her owner to take out of her mouth. I also have a Fager Sofia titanium Weymouth curb, but after the reaction I got with the Fager Felicia I have decided not to try it on the horses I ride now.
I LOVE the Fager titanium bits, the horses LOVE most of the Fager titanium bits, my riding teachers really like seeing me ride their lesson horses with my Fager bits double bridle, so long as I use the Fager Victoria Mullen mouth Weymouth. I have not used the Fager “replacement” for the Victoria, the Fager Diana Weymouth (much more curved mullen mouth than the Victoria) since I am still recovering financially from the Fager Weymouths the horses tell me I am not good enough to use (other horses may like them, these two horses do not.) Again I emphasize that my hands have PROBLEMS, these other Weymouths can probably get very good results with riders whose hands are steadier than mine (no hand tremors etc…)
The double bridle bits work VERY WELL with the Weymouth wider than the bradoon and I plan to use the wider Weymouth curb the rest of my life no matter what metal the bit is made of, unless the horse I ride cusses me out or my riding teachers tell me otherwise.
I wish they still made the Fager Victoria Weymouth, the horses have no real objections to it, if my hands are good that day they will reach out and take contact with it and keep contact with it when I drop the bradoon rein and just keep contact with the Weymouth, and if my hands are not good that day they have minor complaints (raising their head some and looking unhappy.) So long as I ride with a sagging curb rein I can use the Fager Victoria Weymouth and the Fager Alice bradoon no matter how bad my hands are that day.
I ride Forward Seat, not dressage, and the horse accepting the bits I use is EXTREMELY important to me. I want the horse to move cheerfully with its nose stuck out, relaxed mouth, relaxed poll, relaxed tongue and relaxed neck, reaching out for contact confidently and cheerfully. I do not do collection.
Sorry for the novel. I hope you find something you can use in it.