Just received a John A Maxwell
Instruments- discuss specific features, luthiers, instrument problems & questions
Dusty's right- there is no room for fine tuning beads or any kind of fine tuners behind that bridge. But if the wooden pegs are well fit to their holes, and a drop of Peg Drops applied and let to cure, then the pegs 'should' turn smoothly and hold well... as they are supposed to do.
People who buy dulcimers find out pretty quickly if they like wooden peg tuners or not. Some people won't buy vintage dulcimers by a known maker if they've had their pegs replaced with geared tuners. Other people won't buy dulcimers unless they have geared tuners. Those people aren't usually that interested in an antique or collector dulcimer. Don't worry about it, because you can't please everyone.
In general, it's best to keep an antique dulcimer with its original wooden pegs if at all possible. There are thousands of geared tuner dulcimers all over the place to buy if one wants or needs geared tuners. And only a finite number of pre-1970s dulcimers in their original configuration.
You can take pride in preserving an old instrument in a way that is faithful to its maker. Remember the word 'restore' means just that- to restore something to the way it was. Your Maxwell has a huge amount of charm and grace and should be a joy to play when strung up. I can tell you care about it. Maybe you can record a simple tune for us on it soon. :)