Perhaps this is an easier translation.
When using the Tiblock according to Petzl’s instructions ( http://www.cec-canyoning.org/cec/images/tbloc2.gif ) the rope frequently slips through the clamp. We found the direction of the karabiner, on which the body weight hangs, not very favorable for its effect. The karabiner often remained hanging at the top of the tiblock thereby forcing the rope away. Unpleasantly – even if the breaking load is sufficient – we noticed, this rests the whole load on the thin bars. Proposal for solution: We considered for ourselves a more favorable version and came upon this solution. This is to change the course direction of the karabiner on the rope. By passing the rope through the karabiner (as per the image http://www.cec-canyoning.org/cec/images/tbloc1.gif ) The downward pressure on the karabiner transfers more easily into the taper. The squeezing effect is therefore optimal. With this technique no slippage occurred.
John Chisholm