Single Setting Torque Wrench with extension calculations

[Spoolx]

All,
I have been going back and forth in my head on if I should shorten my extension or increase it and I need a second opinion to straighten me out.

PN: 5T-I-SET
https://snaponindustrialbrands.com/...nt/PDF/Snap-on Industrial Brands CAT4 113.pdf

Its a break style torque wrench that comes with certain workheads that are 2.5" from torque centerline to pin location in the workhead (specified by the manufacturer)
https://snaponindustrialbrands.com/...nt/PDF/Snap-on Industrial Brands CAT4 114.pdf

I am trying to use a torque wrench with a larger setting (30inlb) to torque a fitting that requires 16inlb... I can't decide if I should shorten the 2.5" or lengthen it... I've convinced myself that both are right. I've drawn free body diagrams and all but I need some advice.

Anyone have a suggestion?

 

[JBA]

In my view neither will help. Lengthening or extending the arm will only alter the amount of force required on the end of the arm to snap the wrench at its 30 in-lb setting.

 

[Tom.G]

There is a calculator at: http://www.rv7.us/a_u-torquewrenchsetting.htm

To shorten the working distance, enter a negative number for the extension length. For instance if you shorten by 1" the wrench will read 26.7 in.lbs. when the fastener has 16 in.-lbs.

Cheers,
Tom