My latest findings, for anyone struggling to get the eccentric exercises to work for golfers:
Basically, if it ain't making your tendon a bit sore whilst doing the exercise, it ain't working. Experiment with doing the exercises (the ecentric wrist curl and the eccentric lowering outwards) at different elbow angles. SO fully straight, a bit bent, 90 degrees and as bent as possible. For me, doing them with my arm bent as much as possible seems to find the sweet spot. It causes moderate pain whilst doing them, and after about a week of it I finally feel like I'm making progress with treatin g the injury, after 8 weeks of not getting anywhere. I have been recomended to do 2-3 sets of 6-8, twice per day, every other day. Afterwards, give it a really good massage, and ice, and also do that on the day off. BAsically really look after it to aid healing. It will definitely feel pretty tender for a bit, but within 12 hours for me, it feels noticeably stronger.
Usual caveat about seeking professional advice etc.