Well, you breakdown of course!!! Don't even make it out of their hillclimb driveway and you pick up a tack-tack-tack-tack-tack. 

You know the sound don't you. No? Neither could any one else there. It wasn't that cold either. As it would turn out there was a brass monkey around. Under that cute bonnet. What is that? Tack-tack-tack-tack-tack.!!!!!! 

No you lot press on. We'll be right, no you enjoy the day! We'll be fine. 

90 minutes later a Harvey Tow truck meanders up the hill with a well spoken & fluent driver to get us back up the road before dark. A scary ride later the TR is reversed into it's ‘snug harbour' none the wiser. 

What is that? Tack-tack-tack-tack-tack.!!!!!! 

Several passionate calls go by, pleas of help, desperation, it's gotta be fixed by next weekend!!!!! Mt Cootha is on.!!!! We can't miss that, can we? 

What is that? Tack-tack-tack-tack-tack.!!!!!! 

Manifolds unfold, compression test, OK!! rip the head orf, Well, well, well, looky there!! 

Tiny, little, mashed up, brass screw that parted from the butterfly of the Dellorto's at high speed and enjoyed a chat with the head and those nice "marhle" pistons. Closer inspection proved no damage to piston crowns or head, no valve damage, no scores to settle in the sleeve, by God, we can re-assemble by Saturday and be ready to slap it around the closed roads of Sir Samuel Griffith Drive with not a worry about the constable around the bend with his hair dryer hanging out the window. OOPS, sorry we were only the touring party not a competitor. 

Keep those Brass Monkeys warm fellas, life does go on, and no more bloody, Tack-tack-tack-tack-tack.!!!!!!