I have a Henntech idler in my Tiger and it's the best thing ever. Rock solid mounts and no wiggle or slip in the idler at all.
I replayed the M3 set screws with M3 hex head bolts just to get a stronger hold on the axles.
Tiger I - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant