My current issue is a real stubborn one. It's the final fault to be solved before it'll finally write. In the gaming world, it would be the Final Level Boss of faults - the fault that requires the really big magic fighting hammer. It's a doozy, and it's had me scratching my head and making fruitless minor changes for a couple of weeks now. However, I might have missed something really stupid when I copied the original wooden linkage system. I've replaced a sliding fork and pin linkage with a fix