Are you in SEQ Mick?
I see your e-mail is Australian which is great. Do you use facebook? If so check out the social sailing Hobie group I started here:
https://www.facebook.com/groups/474123539363235/. If you don't use fb have alook here
http://hobie-au.ning.com/group/seq-social-hobie-sailing. I'm always looking for other Hobie Cats to sail with.
10 Bushings wont be enough right? If you have the newer style die cast gudgeon you only need 8 - 4 per side. 3 fitted into the gudgeon and 1 where the pin goes through the hull. Although the brushes never seem to stay in the top hull one dependant on angles and pressure.
Are all post 2002 boats fitted with bushings from new? Regardless of year the brushes are always fitted to the die cast gudgeons. Not sure what year they were made standard.
Do the Hobie supplied bushings require 'trimming' to length? No, just slot them in.
Where is the best place to by some 25 mm Delrin in SE Qld? There's a lot of talk of people sourcing the rudder delrin screws from other places, like a Bunnings type hardware is the US. I've looked over here in Aus and think your best to just buy them directly from Sunstate Hobie. If your unable to make the trip up to the Brisbane store just ring Mal and Trish @ their Sunshine Coast store, orders taken over the phone and they will post them to you.
Can anyone who has drilled these out and bushed them, explain how they did the job? Are you talking about drilling out the old delrin screws or brushes? Both can sometimes be hard to remove but given you have an 02 model H16 they should remove easily. Brushes just need applied pressure, using something of the exact same size makes this easy or some soft hammer with screw driver action. Delrins screws on the other hand can be painful, lots recommend drilling out the centre as large as you can before damaging the threads. Then using a hammer/screw driver to clean out all the left over bits.