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Wobbly. Everyone seems to have a different setting, some very loose, some less loose. I have mine so it allows mast rotation relatively easily to 90 degrees. Any tighter and you'll loose rotation, any looser and I'm not to keen on it. Someone will probably explain benefits of a tight and loose rig. I set mine by putting the mast pin in and taking the slack out of the forestay, tie it off, remove pin. That should be enough tension to allow the right amount of rotation. I don't think there are many facts and figures like you'd get in a dinghy class, as there's far less tension involved.
If you go to the Shanklin web site then go into Sailing then Sailing hints and then into Measurements you will see all the details of the 15's that sail at shanklin with pictures at the bottom showing how to take the measurements. Hope it helps.