Sticky Stifle - Days 10 and 11

Fred is still catching her off-side stifle on every stride first thing in the morning and if she has been standing eating hay for a while during the day. I lunged her Saturday and Sunday to free it off and then rode out on Bella (TB 6 yr old)whilst Beverley (a girl of 28, who has been coming here to ride since she was 11yrs old) rode Fred. Beverley didn't like to trot Fred as she could feel that she was "Lame", as she put it, but it was just the stifle catching slightly, so I told her to ignore it and push her on. We did an hour both days, but Fred is still sticky this morning. I am so dissappointed. The vet says to keep on, but he is not hopeful. I started to mouth Emily, my 8yr old 'Feral' Standardbred yesterday as she had her teeth done last week. I stsrt mouthing using a full cheek French Link snaffle and tie the head round to a roller - a small angle to stsrt with, so they can learn that they are restricted and cannot fight the bit laterally and win. This increases in angle, on both sides (10 mins at a time each day)for 4 days, untill they are almost touching the roller. This is only done for about 5 mins though. Emily was very good. She didn't resist much and started turning in a circle, which I like to see. She tries so hard to please that it almost makes you cry. If anyone could have seen Emily 2 months ago, literaaly climbing the walls of the stable every time someone went in, they would not believe how far she has come.