As per Alamas ...
1- Make sure your weapon is empty of cartridge (as always)
2- Remove the front and middle band
3- Open the bolt and remove the screw on the upper side (in this position) of the bolt
4- Look at the two front lugs of the bolt. You can easily see the right one. When you can see the left one, these lugs are in a larger part of the receiver which allow these lugs to turn to the right. The front part of the bolt will turn independently from the rear part. When you have turned about 60Â°, pull the bolt handle to the rear and remove it from the receiver (and the front part too which is now apart).
5- With a screwdriver of proper dimension, remove the screw of the right side of the receiver. Pay attention not to damage the wood with a too large screw driver.
6- Remove the screw behind the trigger guard (you can invert 5 and 6 but it is easier that way).
7- Pull the trigger guard to remove it from the wood. The trigger mecanism and the magazine come with it.
8- Now you can see two screws. They were hidden before by the trigger guard. There is only one screw you can remove with a classical screwdriver (the others can be removed with special "fork" screwdrivers only). Remove that screw. Now you can remove the receiver and the barrel from the wood. I think you don't need any further disassembly to correctly clean up your carbine.
The assembly is more or less in the opposite order : When your receiver and you barrel are back in the wood, you can put the middle and front bands before screwing the receiver to the wood. Put the trigger guard in place. Put the screw of the right side of the receiver first, but don't screw it hard (or do you say tight?). You will certainly have to press on the trigger guard to ease it. This screw is sometimes hard to put back in place. You finish by the screw of the trigger guard. When it is back in place, you can finish to screw the screw of the right side of the receiver.
Sorry for the mistakes in english, had to wrote it fast. However, I hope the explanations are clear enough.
Co-Author of the book:
Banzai Special Project No. 1, The Siamese Mauser, A Study Of Siamese / Thai Type 45 & Type 46 Long Rifles and Type 47 Carbines, Including An Overview Of Siamese/Thai Weapons 1860–2014