Thanks Backbone for invitation.
Hello to all, it is my first post on EB.
In my boom I’ve used string mechanism to extend 3rd section of boom – same as Jennifer Clark's and used in 8421 crane, mainly because of lack of space inside boom for any other more sophisticated solutions.
And it is just simple and good working mechanism.
@rocky100370:
Sorry, I do not have any part list for this boom. Generally you can see from the photos what type of parts are and estimate the quantities required.