I'd be keen to acquire a wooden block - similar to Habakuk's - for stretching. The one Habakuk used wasn't big at all, but it looked solid and thick.
Pity B&Q DIY stores didn't sell them in self-assembly packs! I'd need step-by-step directions about the type of wood, dimensions, where to cut it in half, where to drill the holes, what length of bolts and any other specifications.
Any thoughts, anyone? More to the point, any carpenters?