Obvioulsy without the aid of gravity injection with a medical syringe is your best bet along with a brush coat. You should not need to thin the hardener unless it particularly thick. After applying the hardener, if you are going to build up more than a couple of inches then you may want to carefully fix some screws in the timber to give support to the filler as it dries.
It's unfair having a go at you Evelyn because people like you are invaluable to the cause (and there aren't many!) but I have very good cause to feel the same about EH with regard to work carried out at Uppark House.
EH is far from perfect - and I don't feel passionate about them - I am very critical about much, particularly listing which concerns me hugely - I just think it's so easy to apportion blame when they are really underfunded, staff are leaving and there is a great deal of politics involved, at so many levels. So much however is wrong with the protection of the historic environment on a massive scale that it's easy to get bogged down in detail which is in the overall scheme of things sad but not vital. Grade I buildings are falling down - as are II* and II - they are being demolished at a rate of about two or three a week...
I have spent today - as yesterday and so many other days - whacking off e-mails and writing stuff and telephoning people (and it's all unpaid - my choice) and doing bits of research because I, too feel passionate about our built heritage and its protection. But many don't!
The major problems with EH have been raised with the DCMS Commons Select Committee, and unless the smaller problems are raised then the government will be unaware of them.
This site is all very well - but submit concerns to the government, it will have far more effect!
Very funny. What a difference a comma can make, that should have read "without the aid of graivity, injection is your best bet" if the wood is low down you do not always need to inject.
ahh.. ok, you had me puzzled for a bit there.. now that makes sense.. <IMG SRC="http://www.periodproperty.co.uk/discussing/smileys/wink.gif" BORDER=0 ALT=""> think unfortunatly I'll still need to inject as some of the hardener will need to move upwards or sideways.. just have to figure out wher to get the needle :-