[VictoriaHardware]

OK, looking back at my notes and pictures there is one vertical whisker and one horizontal one (pic 1)

As you said, the vertical metal channel was spot welded to the sheet metal channel that mounts to the glass. Originally that felt was held in place by the metal edge being crimped down in two places. I bent the metal up slightly to get the old felt out (pic 2)

The new whisker was cut, filed, and test fit in the channel. After restoring the metal the new vertical felt back was slid into the old metal channel with a small amount of light oil (pic 3)

Here is the top end as it is in the fully assembled window (pic4)

The horizontal felt got three new handmade stainless staples.