Davis_VS Yahoo group:
https://groups.yahoo.com/neo/groups/davis_vf/ You have to be a member to see much or post, but almost everyone on it has one or more Vertical Feed machines and most of us use them
The tutorial on how to clean a New Vertical Feed is invaluable - NVFs have about 100 parts (*NOT* an exaggeration) which is a LOT of parts for an antique machine. I would have been lost without it!