I just stumbled onto this thread; and I don't know what your supplied tool looks like; but I recently augmented a supplied tool for the nutserts I installed while mounting my sliders.
The "tool" consisted of the nutsert, a "spacer nut" (inside thread dia. is greater than the O.D. of the Allen bolt threads; allowing the Allen bolt shaft to turn freely inside of the "spacer nut") which provides a holding/grip point for the tool and nutsert assembly, and a "tightening/compressing Allen bolt.
First, I added a star washer between the nutsert and the "spacer nut"; which creates friction between the "spacer (holding) nut" and the nutsert; minimizing the potential for the nutsert to spin in it's intended hole when tightening.
Second, I added two flat washers between the "spacer/holding nut" and the Allen bolt. I stacked the washers such that their slightly crowned and more "polished" surfaces faced each other. This creates a bearing surface between the turning Allen bolt head and the non-turning "spacer/holding nut" during the tightening/compressing of the nutsert.
Add a little WD-40 to the Allen bolt threads and the two washers (note: try not to get any on the outside of the nutsert compression flanges). Insert the nutsert and tool assembly into the intended hole. Hold the assembly with a combination wrench; and press in on your ratchet and Allen socket as you tighten. Worked like a champ for me!
When installing a nutsert in a location that has multiple layers of sheetmetal; it is imperative to enlarge the hole in the "inner" sheetmetal layers; to allow for the mushrooming of the nutsert compression flange. I used a rotary file bit in my die grinder. At the least, you need to thin out the layers; if you can't widen them enough. This will allow the compression flange to push the metal out of the way and squeeze tight against the back of the skin you're mounting the nutsert in.
Hope that helps some.
6" FTLA w/HD TB & SS,
JKS spg rets., rr spg mnts.
37" BFG KM2, 17x9 MT clssc II, Blstn 5100,
Finishline West RB, LoD FB, SB XRC10
PP mod'fd boat sldrs, ARB rr DC's, TERA 44 frt xl hsg,
Sup'r CrMo xls, 5.13 R&P, Reel 1310 DS,
Kilby Evap, Bnchmrk KISS, B&M Trans culr,
sPOD; Aeroforce, FlashPac, Airaid CAI, Magnaflow relo,
Cobra 75, 4' Firestik, Woods Hood & TG holds