I think that as the cowl is new, probably some 10 flights or so might give it enough play for it to come in contact with the spinner. This could have horrible results at 10k r.p.m. That's the reason why I want to perform a preemptive fix instead of waiting for the problem to arise. I thought about the washers on the firewall but I haven't decided yet on the definitive fix that I'll be performing. I was really hoping that there was a washer that had the crankshaft's diameter so I could space the spinner.