It's a take down screw. Loosen it and the gun seperates into two sections
There were a few that do not have a standard trigger, but use a THUMB trigger. Do a web IMAGE search for Winchester thumb trigger rifle, and you will find it.
thumb nail, thumb tack, thumb screw, thumb print
The thumb screw was a device to torture victims. The victim's thumb was placed in the device and the handle was turned to put painful pressure on the thumb - not very nice.
The rifle was produced from 1904 to 1923, originally known as the Winchester Thumb Trigger Model. In 1920, the rifle was renamed to become the Winchester Model 99, and it stayed that way until 1923 when the rifle was discontinued. Value is heavily dependent on condition, but should exceed $1,000. You will need a hands-on appraisal for a better answer.
The surgery cures the trigger thumb--why should there be any cash settlement?
There are a lot of Sears Ranger rifles - what is the Ranger model number?
trigger finger/thumb
thumb
The main difference is that the hammer and the thumb lever to break it open are reversed. On the 37, the hammer was rear and the thumb lever was farther forward. the 37a is reversed. the 37a also had a gold colored trigger.
Yes - you can get trigger finger in any finger in your hand, including the thumb. See the video link below on the symptoms of trigger finger.
Next to the coolant reservoir... black hose sticking forward with a plastic screw in it...
There is no thumb press that is a kind of torture. It is called thumb screw torture, and it is a type of European torture in which the victims fingers and thumbs were placed inside a vice, and crushed.