Josh said that they were running spools to get ready for the Reedy race as well.
I think that article said that two of the 4 XRays in the A were running spools. The picture was of Josh's car I believe but not from the pre-worlds.
He said he was running a spool at the pre worlds - that's why I asked about spool/one-way. I wondered if the one way meant there was less chance of the belt skipping, perhaps because skipping is more likely under braking than power?