First of all welcome to the GB forums, you have posted the same question in 3 different threads. One time is enough, there are many members that will see it and answer to you so don't worry. 
I have already answered your question in another thread  but here it is again: Larrel needs four pieces of machinery in order to fix the Astrolab, after you give them to him he is suppose to speak with you. However you will need to have to the heartstone gem in your possesions in order to help you.
__________________ "When I am working on a problem I never think about beauty. I only think about how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." Buckminster Fuller |