Bunnings have these wonderful brackets which attach to standard ‘star’ posts/pickets which enable wooden fence rails to be joined to them (there are also corner ones): http://www.bunnings.com.au/post-accessory-post-bracket-flat-12215_p3040743 Also see: http://whitesgroup.com.au/Products/WhitesSpecialistRuralcatalogue/tabid/126/ProdID/174/categoryId/39/Post-Caps.aspx?sid=[PARENTID] & http://www.waratahfencing.com.au/Product/Tools-and-Accessories/Fencing-Accessories/GalStar-Post-Caps.aspx There also exists a plate to prevent star posts from sinking: http://www.waratahfencing.com.au/Product/Tools-and-Accessories/Fencing-Accessories/Anti-sink-Plates.aspx available elsewhere.
