Lazyjacks - building your own system.

[puddock]

CAUTION:

When trying this in your back garden, clear up before it gets dark. This will avoid instances such as the dog shooting out the back door and coming back looking like a sheep on acid

 

[PlankWalker]

You generally need more tension with the aft lazy jack than the forward one. Therefore it is better to "cascade" forward rather than aft as every time you bifurcate the line the tension halves.