As a more on topic comment for TIM
Tricep exercises I find really good are:
dips - you do
pushdowns with a rope handle
french press
kickbacks are a great isolation exercise either with a db or cable stack.
standing db french press is great, ie hold one db loosly in both hands (at one end, thumb and index finger either side of handle, plate part on palms) and lower behind your head, then extend up wards.. can also be done lying down, or with a db in each hand. If lying down ensure your upper arms are kept vertical and dont swing. - i think you may be doing these.
You can still do a close grip bench type of exercise, by useing a db in each hand, this allows your wrists to move freely, also they are pronated 90degrees so much less wrist strain, you can also just use the one db held by both hands, keep weight above upper chest and push strait up. (while lying down)
And if going to a gym they shoul dhave some kind of tricep isolation machine, i like to do one set of these last to really push you as their is no risk of a weight falling on you, and you can focus on straitening your arm, rather than holding the weight.