I was hoping you could be more specific.It's a Ludwig pedal.
I have seen 3 online, and they are all dated 1970's. No one seems to know the model of them however.
I did find, in my searches, the tightly kept secret on how to adjust my Ghost pedal. Might have to steal your foot plate idea since mine raises up once attached to the bass drum hoop and causes the drive link to come in contact with the head. Sorry for the derail.