For those who do do want want to buy, or use mechanical ascenders, try using: Either an Autoblock or Kleimheist knot
instead of prussiks on your main harness line and you foot / feet line. They will hold when weighted, but are easier to slide up (or down) when unweighted, than a prussik.
- use a triple prussik on your safety
line and make sure you "tend" the knot
as you ascend - keep it somewhat tight, uniform looking. A prusik that is ignored and gets way to loose may not hold a fall.
If you are not experienced in climbing, talk a short lesson a rock climbing wall, or do some research
, etc) on ascending fixed lines.
And practice in your garage, or off a tree limb, to make sure you have everything down pat. And the 1st time up teh mast
, just go up 5 ft, and make sure you can come back down... try simulating a fall from 3-4 ft up, does your safety
line hold you ,etc.
And whether you use a mechanical ascender or prussik type knots, make sure you keep as little slack in the lines as possible. If you get lazy and have 3 ft of slack in your safely line (prussik knot not move up enough as you ascend) and happend to take a fall, that will put an extreme amount of force on your rope
, knot harness and you - something may fail. A 200lb person falling 3 ft onto a static (not a dynamic / stretchy rope
like climbers use) will exert alot of force!
Finally the line used for prussik or kleimheist knots have to be the correct size for the line they are being wrapped around. Too small may not hold your weight, in a fall. Too big will not "bite" properly on the main line, which will cause it t oslode instead of grab, and it may not hold your weight either!
7 mm Accessory Cord, nylon. Use with 3/8"-1/2" (1cm-1.3cm) main line, red, 2,600 Ib (1,179 kg)SRP5008608 mm Accessory Cord, nylon. Use with 1/2"-5/8" (1.3cm-1.6cm) main line, black, 3,100 Ib (1,406 kg)SRP5009009 mm Accessory Cord, nylon. Use with 1/2"-5/8" (1.3cm-1.6cm) main line, 3,600 Ib (1,632 kg)
How to Tie and Use an Autoblock Knot -- Step 2 toTie an Autoblock Knot
Prusik Knot | How to tie the Prusik Knot | Climbing Knots
How to Make a Prusik Knot