ldcad arrows helpers

[Roland Melkert]

• Suppose I have a bunch of parts that I want to rotate about some common centre. I can place a helper there and then select all the parts (with the helper first) to rotate them all.
  
• Suppose I have two long beams pinned at their ends, and set at some angle to one another. I want to know which holes I should use to brace the structure. I can insert two helpers and, showing the distance between them, move them around to various holes until I find a length close to an integer number of studs.
  

FYI: The first scenario can also be handled using a (fixed) custom selection center, unless you want to preserve the location past document close.