I don't have the metal tiger hull but I do have metal idlers for my tiger, and with alittle thread lock they become rock solid. I dont think I've ever undone them besides when I installed new bolt-through axles!

I hate having apparently random mounting holes on the plate... On my asiatam P3 only ONE hole lined up with the gearbox, I had to drill & tap out 2 more (works fantastic now ! )