Yeah, what boblenon said (I'm his evil apprentice).
It took quite a bit of tinkering. What I would suggest is locating the signal where you like it, and making sure that you have a secure attachment point under the layout for the actuator. Homasote would work, but I'd suggest trying to screw into wood.
Try to keep the actuator wire as straight as possible. Avoid as many bends as possible. It took some 'experimenting' to find the proper location for our actuator, and this resulted in a bends, then straightening, and another bend. This eventually weakened the wire enough that it'd flex and possibly jam on something. What I came up with was finding a piece of brass tubing just slightly larger than the actuator wire, and slipping it over the actuator wire, then bending the wire and putting it into the actuator arm.
Whenever I decide to install a signal gate or seahempore signal on my modular layout, im gonna locate it at a WOODEN location to save myself the difficulty in locating.
Also, if you will be using the remote actuator (allowing you to locate the tortoise up to 18" from the actual signal), try to keep the distance between the actuator and the signal as short as possible. This will result in smoother operations.
I hoep this makes sense. Our signal looks pretty awesome now. I'll try to take some pics before I go home, if i remember.
mike