Where do I get the cap / bung for the top of my masts from? Measures about 32mm OD and 25mm OD and has a hole for the sail pin.
Maybe I'm not googling the correct name of it. I'm in NSW central coast.
Do you mean this a mast plug?, Sailworks has two sizes 28 mm and 30 mm, www.sailworks.com/the-gear/mast-plug-28-mm.html

Think best to identify the brand/model of mast and then either find a retailer who sells those masts or call a local windsurf shop to check if they have the matching size mast top plug (coz different masts have different sized tip diameters)
Fyi I've previously purchased some from Surf Sail Australia in Perth
Maybe ask local sailors if they happen to have broken masts in their shed that might have the matching plug
Think best to identify the brand/model of mast and then either find a retailer who sells those masts or call a local windsurf shop to check if they have the matching size mast top plug (coz different masts have different sized tip diameters)
Fyi I've previously purchased some from Surf Sail Australia in Perth
Thanks . I found them and ordered a couple.
shenanigator: Just beware there are two popular types of bungs. One is not compatible with the other, and can cause the mast to pop out the end of the rig inflight. You have to check the caps on your sails to make sure what you order is compatible.