AWM8163 Cylinder revolves with friction - sock?

If it saw service with the British it will be a Webley.
You may find some interesting reading here

Webley Revolver

Hi james.this is all i could find,try this link ans see if it helps you out.
how to identify an old hinge breach revolver with 3 barrel nickel plated...

Not enough info. Top break ? Serial Number ?
GunParts' website may can help you. They have schematics and parts lists that you may be able figure out what you need to do.
Iver Johnson Revolvers Gun Parts

Open the revolver portion that holds the rounds and count the number of rounds. Has nothing to do with the barrels but the cylinder itself behind the barrel.

a few different model S & W 38 cal revolvers made
can you add a photo to your question
do you have measurements of the barrel
Smith Wesson

contact a S and W collector or gun auction or dealers web site
Guns for Sale Gun Auctions

https://www.gunvaluesboard.com/i-have-had-a-rossi-interarms-38-special-stainless-steel-5-shot-revolver-for...-30725949.html

Maybe that web site could provide more assistance to you.

In the web site above it states in a discussion that the: "M88 revolver started with W.
N"Hi, This is want I can tell you about Interarms imported Rossi revolvers.
Don't know about other importers.
Model 88 (5 shot SS 38special) had W prefix followed by six digits.
Model 68 (5 shot blue or nickel 38 special) either had D or AA prefix followed
by six digits.
No part or serial number or prefix indicates month/year etc.""

NO dont change the belt, chances are its just the cable needs adjusting, slacken the 10mm nut on the adjuster that goes into the casing on the left side of the machine ( think its the top cable that adjusts the cylinder) after the nut is slackened off turn the adjuster clockwise so its going into the casing,you can do this while engine s running. the cylinder should stop turning as you wind in the adjuster. I would also suggest that the cylinder is turning too easily and it will need adjusting by turning the adjuster screws either side of the cylinder. turn the adjuster screws clockwise one click each at a time until the cylinder just touches the bottom blade when you spinn the cylinder by hand( with the engine NOT running!!!!!)

Can be dirt or particles that have made it stuck with friction and so a resetting /overhauling with good oiling, degresing will resolve the matter, provided there is wearing off in the drive.
First use a degreasing spray before you can disemble.

This means the revolver (holds the 3 color toners/developer units) never returned/moved to its "home" position.
It could mean a bad or dirty home position sensor or a faulty/bad logic board or possibly a bad motor (not rotating the revolver correctly) try cleaning or replacing this sensor first.
if you remove the covers from the left side of the copier you will see the revolver unit. the sensor is located at the rear of the revolver unit mounted on the frame of the copier.(easy to see) there is one screw holding it and a small wire connector.
These copiers are "famous" for having dirty sensor issues.
If the revolver/machine makes an odd noise when starting up, caused by the revolver then its starting to turn (run the copier with the side cover open so you can watch it) then it would point more to being a drive problem.

Cant understand how the machine will revolve on the 'spin cycle' & yet you can hear the motor on the 'wash cycle' but yet it doesnt revolve!!
Nomally if the water fills, & the tub revolves without the programmer advancing, its because the heater is not working. ie faulty thermostat, heat element, or maybe a wire burned off in the 'heater circuit'. Check if you have 240 volts at both ends of the heat element, with a meter or 240 volt bulb
                         !! BE CAREFUL OF 240VOLTS!!