I am using the 3W75i. I removed all the weight for the cowl and mounted it to the firewall. So, I never flow this one with the weight in the cowl. However, I did do that in my first Dauntless and never had a problem with the cowl moving for coming loose. Just remember the CG on the plans are not correct. They are one inch further back> I balance my at 5-11/16.
Fran