So, having tightened with a 3/8" drive short ratchet I popped round to see a neighbour. He is a retired senior engineer at Perkins diesel & has recently built a Caterham 7.
He lent me a lovely vintage Britool torque wrench, which was calibrated for his build. I set it to 15NM & it clicked immediately. So I loosened the pinch bolts a little & started again.
Much happier with how tight they felt when the wrench clicked!
The lesson seems to be, beware cheap torque wrenches, especially at relatively low settings!
Now on the lookout for a decent quality TW!
|