Realising this is an old topic, but somewhere down the line bound to be someone looking for any solution somewhere here.
For that tank tracks looking mark that the feeds dogs produce on the 132K6, I glued small pieces of foam cut a drawer liner on top of the feed dogs.
I only uses contact bond applied single sided.. I applied it generously hoping that it will 'bite' into the crevices of the tooth I might want to take it off at some point when sewing canvas or webbing.
After a 30cm stitching, the foam started to give in (squashed). Don't know how long it will last, but so good so far