Twitchy steering..?

I would measure the trail to check if it was between 50 and 70 mm (using plumb line and a long ruler). Then measure the head tube angle, so I could calculate my fork rake (easier than measuring).

From here I could decide weather or not to start atually usng money ;)

I understand what you mean mate.

nim23, I think smallfurry has the right idea and will save you money. Its got to be worth checking as a start off point.