Bstrong100

According to the Buffalo forge catalog the 616 is a two speed drill. The shaft with the gear missing had a small gear on it similar to the small drive gear on the middle shaft. The gear you're missing was built to install the hand crank through it similar to the large gear where I assume your hand crank is now installed. I also have a 616 but am not only missing the "third gear" but missing the feed linkage also. Looks like a guy needs to find 616's missing other pats to get the parts needed, oh well. Good Luck!