There are two ways I used to fix then especially half tile when the lugs were missing.
1. Lead strap the length of the tile + 75mm to form the hook on front end bend it over the end of the tile then fold half down over the strap this helps to stop it uncurling. Nail top end to tile batten using galvanized nail.
2. With a masonry drill and drill Not set on hammer drill nail hole in centre top end to line up with batten nail it on the other tiles either side will stop it twisting. I do same with slate eves tiles when the slip out.
B
December 2010