I’ve seen it recommended by some trainers, and tried it myself, for saddles where the stirrup bar is placed a bit too forward for the rider’s conformation. You’re still sliding the stirrup leathers over the bar as usual, but putting something in front of it to stop the leather from sitting as far forward. A full cheek keeper happens to be a convenient size and with a loop readymade to be slid over the stirrup bar. I’ve also heard or wrapping a rubber band around it, but that seems like it would be more prone to shifting
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