How? They have a lip to keep them from going all the way through and the nut on the TRE will keep them from coming out the other way.
I guess it really shouldn't cost much more than those inserts to get the knuckles reamed if you take them off and to a machine shop or find someone who has a reamer though.
Let me re-phrase my opinion, if you had the steering knuckle sitting on your garage table, to the left of it you had those inserts and to the right you had a drill with a reamer bit on it, which one would you use?
-Karl
2006 Chevy K3500 4X4 - No J.B. Weld on it yet!
1982 thru 94 F-Series "The Klogger" AKA Transport on the road, on the trail, or on the trailer!
1965 Chevelle
1975 Corvette