How about instead of a press fit for the pivot pin,,make it a slip fit.
In the center of it's length there be a slightly smaller dia slot the width of the blade.
The hole in the blade for the pivot pin to pass thru be an elongated hole with round ends that match the pin dia.
The assemble..place the blade into the slot and push down into the base till the elongated hole shows clear thru the base.
This will require that the blade be pushed slightly lower than flush with the top surface of the base.
Then push the pivot pin in.
Release the blade, which is spring loaded by way of the small flat spring that toggles it up & down positions over a high point on the lower edge of the blade,
The spring will push the blade upwards and the blade will rise up into that slot and will pivot on that radius.
The pivot pin can't come out as it is locked into the base by the blade
Push down on the blade front and rear to allow the elongated hole in the blade to clear the pin and push the pin out.
Just a thought for a Field expedient repairable/replaceable front blade.
Too much coffee maybe??
