The tuning pins are on the right. The lowest ten strings are single-strung, the remainder bichord.
The leather-covered hammers pivot on center pins that pass through upright wooden forks attached to the keys. The hammer shank has a beak that protrudes behind the center pin and catches on an overhanging rail , or Prelleiste, when the key is depressed. This catch causes the hammer to be propelled toward its strings.
The knee lever operates a "moderator," or buff stop, which lowers a strip of felt (possibly leather originally) onto the strings, muting them somewhat.