Here is the the adjuster:
http://store.catsailor.com/tek9.asp?pg=products&specific=jmoqhqqpr0

And here is the port:
http://store.catsailor.com/tek9.asp?pg=products&grp=524

The backing plate should be inbedded, but there is no reason to lower the chain plates. When you go to the 10 hole adjuster, that will rake your mast aft. I simply take out the sidestay adjusters and connect directly with shackles.
This will probably still allow the rig to be slack, but it should be. That way, when sailing off the wind, the sail goes out to the sidestay and because that sidestay is slack the sail maintains a good shape. Otherwise it inverts where a tight sidestay would be.
Rick