The countless advantages of using a lineGrip
The lineGrip enables you to safely and reliably grab the slackline at any point, then attach the end of the tensioned webbing to a webbing locker, and remove the lineGrip with the tensioning device from your rigged system, before walking it.
Aside from making the line more enjoyable to walk, removing the tensioning system also gives you the option to rig other slacklines with the same tensioning system, eliminating the need for additional tensioning gear, when rigging multiple lines.
Another huge advantage, is the possibility to re-grip the line any time, at any point. This eliminates the prior meticulous calculation of how much stretch you will pull out of the webbing during the tensioning process. It also helps with keeping your tensioning system compact, light, and cheap, because there is no need to carry 70-100m of static rope for an extra long tensioning-system usually needed to tension super long lines.
Ultra-longlines (>500m) are usually walked without a leash, and are therefore rigged at “low” heights on jump-off ground level. Due to the great sag at low tension, they need to be rigged with relatively high tension (15-20 kN). Some slackliners tend to avoid using a lineGrip cluster for this, but rather leave the pulley system in the line.
To avoid the need for an extremely long rope of sometimes 200m+ in the heavy duty 27:1 pulley system, these ultra-longlines are pretensioned with a lineGrip and a second pulley system on the “static” end. Having reached a base tension of 13-15kN, the lineGrip tensioning system is removed, and the static side is completed. Now the tension is finalized by using the pre-installed heavy duty pulley system on the actual live end.
Finalizing the tension from 15kN to 20kN will yield only a small amount of additional stretch of the pretensioned slackline, because 80-90% of the slackline’s stretch has already been pulled out. Therefore a fairly short rope is sufficient on this end, even though a complex 27:1 pulley system typically requires about 10m of rope for each stretch meter.
Some more advantages… when using the lineGrip, you can:
- insert forgotten leash rings to a rigged highline without derigging it
- reset the height or position of the anchor point during the tensioning phase
- reposition any of the two anchor points of a rigged line without derigging it
- untwist a rigged twisted slackline while keeping it tensioned (no need to derig)
- rig a slackline without any rope-pulleys or chain hoist, by building a webbing-pulley-system
- derig any slackline whose de-tensioning system failed
- retension single stacked webbing strands after the stack is set up
- and theres probably many more, limited only by your imagination…