Lockjack twin vs. lockjack sport

[southerntree]

What's better I'm thinking about getting a lockjack and want to know which is better the twin or the sport and why? Also I've heard some pros and cons about the lockjack in general and would be intrested in hearing additional opinions.

 

[AbTeK]

a pruner in brittany called rahed coet has the DIY solution for the lockjack !
http://www.allo-olivier.com/Vos_Photos_Elagages/thumbnails.php?album=37