Aluminium Idler - Do I need this

[Nick]

When I had a Traxxas Rustler my Idler went rather quickly - these are the same as a Stampede and that was on a low geared budget 13t motor!

I would get an alloy' one straight away, I think the "hop-up when it brakes" plan never works, as you can sometimes hear an awful sound, and have to open everything up to find out what it is, then what needs replacing. Best be prepared. ;)