A friend of mine had to make a special Crowsfoot spanner to tighten the base studs on his Panhead Harley.

Once he had made it he then proceeded to measure the length of his torque wrench and enter this figure into a formula in order to work out what he should actually set the poundage at on the torque wrench to tighten the fastener properly.

We ended up with a VERY longstanding (But Friendly) disagreement when I pointed out that the length of the torque wrench shouldnt matter...afterall it is designed to "Click" when the Set poundage is being transmitted through the centreline of the drive end of the wrench.

He poo pooed this idea and looked at me as if I was stupid.

I said that surely if I wanted to use the Crowsfoot on my bike then all I needed to do was borrow it and use my own torque wrench set to the same poundage as his had been and we would get the same result...He agreed...but then I pointed out that my torque wrench is a different length to his and so if I put my measurements into his formulae then we would have a different answer, so bearing in mind that we both used the formulae correctly then why do we have different answers to the same problem!!!!!!!!!!!!!!!

Furthermore, I ask, how does the torque wrench length matter when I can hold the handle ANYWHERE along its length and (Provided I have sufficient strength) it will tighten a fastener to the setting dialled in on the scale????????????

Unfortunately I am not good enough with my maths to figure this one out.

I am not saying that EVERYONE who does it the USUAL way are wrong, I am saying that there must be a way of figuring this out WITHOUT the length of the torque wrench being involved although I do accept that the effective length of the Crowsfoot from centreline of the fastener to centreline of the Torque wrench output is very much necessary.

It is a very difficult question to explain in typing and doubtless I have confused far more than I have managed to get to understand my query, but PPPLLLEEEAAASSSEEE can a mathematical brain tackle this?

Thanks for your time folks