I've been trying to fit 2x2" battens to a wall which I think is made of breezeblock (or similar). I've been using "frame fittings" which required me to drill an 8mm hole through the batten and then into the wall, then to insert a 120mm long plastic plug through the batten and into the holes, and finally to tap in and tighten a long thick screw.
When I do this I end up with the screw & plug just rotating in the wall. The plastic plug doesn't have all that much in the way of fins sticking out from it, and I think there's a possibility that they are ending up in the cavity between the two courses of blocks/bricks in the wall.
Is there some other kind of fixing I should try using, or is it worth trying to glue the plastic plus into the wall first, eg with silicon sealant (or something)?