The torque wrenches I own are:
Sears Craftsman 'Microtork'
10-75 ft/lb or 16.90-105.10 n.m Craftsman 944594 (3/8" drive)
20-150 ft/lb or 33.90-210.10 n.m Craftsman 944595 (1/2" drive)
25-250 inch/lb or 3.61-29.03 n.m Craftsman 944593 (3/8" drive)
ACCURACY: +/- 4% on clockwise or right-hand readings greater or equal to 20% of capacity.
The torque spec for the cam cap bolts are 10nm, which is half of what the spark plug torque should be. It seems very 'light' to me.
I've yet to do my lash check, I'm at 11,100 miles and rapidly closing in on 12k. SO, I'm gathering the tools (and mustering the courage) to do the check my self.
A reliable mechanic from a Triumph only shop says he uses the rear wheel to rotate the cams for the check. If any are out of spec, then off comes the alternator cover so the crank can be rotated more accurately. He also stated they don't have too much trouble with the top end bolts etc. But, I guess if you do it fairly frequently and have the correct tools, plus all the nuances experience teaches you, that would make sense.
Jay