One more thing about glue – check the use-by date on the tube or pack of spincaps. Half (or more) of the stuff on the shelves in the shops are past the UBD. Preferably only buy glue before you need it and keep it in a cool place. If using a tube (eg Hilti, Sika, ramset etc), squirt out the glue until it is uniform colour – ie properly mixed. The first 20 – 50 ml is usually streaked and not mixed properly.
Spincaps are avaliable from Blackwoods, Atkin-Carlyle and most speciality fastener suppliers.