Here is a link to a pic of the new
Associated Spool kit for the TC5. Seems to be in stock here, but I did not go all the way through the order process. Looks like a one piece aluminum unit. Pin pilllows would be desirable. I don't know if the pillows will fit. I think the TIR unit with replaceable outdrives makes more sense from a durability aspect.
diffuser-Thanks for the post. I think that goes both ways too. There are not two sets of the laws of Physics. The big car set and then the RC car set. There are some differences in setup, but more similarities than differences.
John