Depending on condition, $250-$550. These were made 1953-1973. The early revolver with a FLAT loading gate is worth considerably more. The Ruger website, under customer service, lists date of manufacyure.
If the Ruger web site will work for you, they have sn data available.
50-350 usd
50-250 or so
50-250 or so
Yes
Unknown variant.
100-400 USD
when lead of the screw is equal to the pitch it is called single threaded screw
On my 2000 sebring convertable they are on the door jamb near the part that the door latches on to where the back of the door comes to rest. They look kind of like a bicycle tire stem and are held in by a single screw. After removing the screw, you detach by pressing a little raised tab that release the switch from the wire.
50-1000 USD or more depending on specifics
100-1000 USD depending on specifics
screw thread are single threads which means they are not double