I love rivnuts too! and yes you are so right in regard to the fitting tool, so many problems with Rivnuts come down to fitting them, love timber inserts as well!
I must admit I redesigned the trans tunnel/gearbox cover fitting too, after going through that removal process I certainly did not want to repeat it again! Reminded me of the battery access panel in the rear bulkhead six wood screws , who thought of that!
