Hi Andy,
Sorry to ask, but do you have U5 facing the correct way? ( asked politely ), I haven,t got my book at home with me but U5 has a 5degree angle cut into it which should face the rear of the car, as this is where the side of the cockpit sides start to slope down a little.
TR2 should "just" sit on the forward leading edge of U5.......( wish I had my book with me
).
Also...may I ask if you have the same problem with TR1?...just trying to picture the situation.
cheers
andy