I used a different fitting that can be installed with the engine on the mount. It is a brass fitting that is block shaped with a 1/8 NPT male on one side and a 1/8" NPT female in a 90* orientation to the male. It is quite small and has no 90* appendage that prevents it from spinning. You can install that fitting with the engine mounted, then install a straight AN fitting into it, with the restrictor on it.
Fittings available at mcmaster.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 05-21-2022 at 07:55 AM.