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I am on my last 150' of Velocity and ordered another 200'
Step it up and get a mechanical prussik.
Consistent smooth positioning. Smooth metal on rope opposed to inconsistent friction or tighening of cord, rope on rope.
Lock Jacks ability to tend to slack is a simple drop of the tail or feed the slack opposed to the application of force to capture progress or using prussik minding etc
The Lock Jack is far better than a whole slew of knots that need constant attention because of binding, over loosening, side loading biners, twisting, pinching, having to untie because it is to tight or to slack, trying to remember the knot and number of wraps that works best with what rope and the excess bulk because of the addition of another karabiner and prusik minding pulley.
I used to use a few types of prusik cord and found that prusiks have some serious issues; anticipating failure and when to retire, using an endless loop prusik formed with double fisherman’s or water knots being bulky and cumbersome, frustrating because of tying and untying due to changes in weight with heavier saw or increased tension or friction and wear, aggressively and constantly tending to slack. The Lock Jack eliminated these issues as well as creating a safer work environment.
I train an apprentice with little to no experience almost bi-yearly and it is a considerable responsibility to get them confident with the knots and rope movement and to work efficiently and with less effort.
Lock Jack is a safer starting point for an apprentice than the knots because it is a matter of fact that when work is easier it is naturally safer and that is precisely what the Lock Jack accomplishes. I am confident you will find it is more comfortable, feels safer,reduces effort and affords effeciencies.
Lock Jack can be utilized by the novice and professional.
Check out this vid of my children using the Lj.
http://www.youtube.com/user/Ropearmour#p/u/9/4sQEUrvoE10
My kids make it look so easy.
Oh and I am using Srt/Singing Ropewrench and Lockjack for work positioning and am finding it all a very pleasant suprise with a few hiccups as part of the learning curve.
Hope this helps.
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It is more time consuming in situations were you need to retie often such as crane removals. As far as teaching new climbers I find it to be unsafe. If the climber were to not put a hand on the rope and panick pulling down the knob its gravity winning. With a knot more chance of a burn and let go reaction.