I noticed on the "What's New" section of the TLR website they the are new aluminum belt pulleys released now. Any particular performance advantage with these, or is it more a matter of durability? It looks like one of the pulleys is the one that has the seldom used clicker assembly. Is this part now made as one complete unit omitting the clicker function? Does it eliminate the chance of melting or stripping the plastic assembly when running 5.5 or lower KV motors in high traction situations?