Yes, all motion should be in the horizontal plane. As you move the lever to the left, a bar passes out of a notch in the front of the forend lug. Pleasure us with some pic when you get it apart.

I didn't know Christian Ludwig Schindler had it's origins in the late 18th Century. It is possible but usually it is a sequential family line of gunsmiths. By 1900 it was listed as Christian Ludwig Schindler & Sohn Zella Saint Blasii.

Kind Regards,

Raimey
rse