I want to know if I can find a way to adapt a torque wrench to the following Free float handquard tool so I don't have to purchase another armorer's tool I already have but without the Free float jam nut adapter on mine.

http://www.amazon.com/FSI-Model-Armorers-Spanner-Handguard/dp/B004Z3H53S/ref=sr_1_1?ie=UTF8&qid=1414550965&sr=8-1&keywords=jam+nut+wrench

Sure...just buy some expensive metal cutting tools.

for all the work just get the tool

Cheap tools usually end up causing busted knuckles and banged up parts.

Ive used the YHM spanner wrench........for a couple of installs..........one on their tube and other on a Chicom tube..........I don't recall any torque specification for the nut.........with that being said the YHM tube uses two anti rotation screws........and the Chicom tube just one.........I used blue Loctite on the jam nut and have had neither of the two to come loose.........and have shot the crap out of both of them...............