3-line control systems
I noticed this is used for CL scale models.
Questions:
1) how does it work? is the third line working against some kind of spring?
I saw the many 3-line bellcranks offered by Brodak, but could not see how they work or what the differences between them are.
2) Is a 3-line handle suitable for 2-line models too or is it better to have separate handles?