How much of your weight do you have to use to push the tail down? That would be similar to the amount of weight resting on the collector box (allowing for leverage etc)

I'd have thought that failures would be more likely due to metal fatigue from the constant vibration.

Yeah, I've Ivanized it 5 years ago, and at the time didn't change any of the o'rings.

 

Nice job . Expect you hope to be finished in time for Mayday, when hopefully the weather bucks up. Going to Le Mans on Thursday for the 24hour. Looking at the current forecast for the early hours, the heated grips will be getting a workout for sure.

Managed to get a couple of hours in the garage/workshop/playroom on Saturday afternoon. Ended up drilling out the snapped stud and fitting a Helicoil. I hate using Easyout's, they can be good when the snapped stud is loose already, (who snaps a loose bolt/screw?) but if the thing is seized or corroded in place, I find that the simple act of using one, forces the remaining stud material outwards onto the thread and nothing happens until the easyout snaps - then you've got two problems!
Anyway, coolant Foo Foo valve sorted and back in position. 

I uploaded a file to the downloads on this, check it here https://foc-u.co.uk/index.php?action=downloads;sa=myfiles;u=889