- as well as folding once in one dimension (as seen in this image) it folds again in another dimension (towards you as you look at the picture). So it folds in four (in the traditional case - more recent ones are more complex: http://content.answers.com/main/cont...entersRule.png ). It sounds like a very extreme sort of tackle - such as those administered by M. Chabal: Sébastien Chabal - Wikipedia, the free encyclopedia .
As to the "gritty stump" I'm really not sure. I imagine the stump is a reference to a tree-stump: http://dcartnews.blogspot.com/Ball-Stump.jpg . A tree-stump is often referred to as "gnarled" - gnarled: Definition and Much More from Answers.com - so maybe that would be a good starting point for your translation.