HERITAGE IV Bypass Door question

[VittorioWV]

Hello to everyone , as a new owner of an 2022 Heritage IV stove , I have at first a question related to the Bypas Door than should be closed to activate the Catalytic combustors .

I am fully cleaning and replacing a few small parts / gaskets / insulation , to be ready for the next season of my new for me ( but used ) stove , and I noticed through the top flue opening that the Bypass Door is not completely closing , when in closed position , but there is left approx. 1/8" if inch space on top/left/right , but nothing at the bottom where it is attached / hinged to the bypass shaft .

I do not see on the parts list any indication of a gasket for the bypass door or the surrounding frame .

Also there is no indication on the manual if the bypass door can be used just partially open or closed , because it is possible to just do that .

If anyone on the forum knows something about , please let me know .