Here's Pictures of the Model A Fuel Filters

[Tom Wesenberg]

Most of the pencil filters fit fine by just slipping them into the valve. Years ago I had to use solder to tin the end for a tighter fit.

When you unscrew the valve you may find it very tight. Try to use two wrenches or at least use your hand on the valve to push as you pull with the wrench with you other hand. You're trying to use turning torque, rather than a side pull, to unscrew it.