I've only seen one of these models once at a show. Basically, the wooden leaf springs raise and lower the bearing edges while the hoops stay rigidly in place. Elaborate concept. I would strongly suggest that rather than altering the original design by modifying the mechanism, just get a properly fitting calfskin.
As FFR428 stated, try Matt at CT Pro Percussion. He custom makes calfskins to fit the strange dimensions of 18th and 19th Century rope tension drums. I've been in his shop. If he can make those weird Trixon Speedfire bass heads, he'd probably have no problem with the head for your drum.