I have just found this on Chambers Website, which might help.https://www.gunspares.co.uk/products/24464/G71/ . I bought this recently to have a look at one. Unfortunately, the safety catch is missing although the gubbins are there on the inside. This came with a missing medallion, none original stock screws and the stock had broken at the fore end at some point and been repaired. This is more or less a G 78/79 with a different trigger and a barrel sleeve. The sleeve on mine will turn (I am guessing it shouldn't) so it either needs the foresight sliding back to hold it tighter or a washer/shim behind the sight. The sleeve slides over the barrel and is held in place by the foresight and there is a threaded piece at the end of the barrel that screws onto the barrel.
Undo the front stock screws and the rear one at the front of the trigger guard. The action should lift out of the stock, and leave behind a small cranked bit of metal that holds the trigger adjusting screw. It is located by the front trigger guard screw so if you have fully removed the screw there is a chance it could fall out of the stock. Lift the cocking arm out of the cylinder and undo the barrel pivot screw and remove the barrel/breech block. If you want you can undo the tiny screw on the LHS of the breech block and remover the barrel plunger and spring for lubing. I usually push the plunger with a small block of wood when removing or replacing it. Once you have lubed it, replace the spring and plunger back in the block and tighten the screw.
I am not sure how the safety attaches to the gubbins, but assume it would just hook on. The safety is just a simply rocking bar that stops the trigger from moving. It is located on a bar in the cylinder sleeve and centralised by a spacer and a spring. It does not need removing for the strip.
Put some weight onto the sleeve and you can remove the trigger pin/cylinder pin. Once it is removed, slowly release pressure and remover the cylinder sleeve, guide, mainspring and piston.
The piston washer is leather, with a fibre spacer below it and is held in place by a screw, ( which I prefer), rather than a threaded nut, like some of the Milbros.
As the screw was tight and the washer in good condition, I did not remove it. The mainspring in mine was something that someone had fitted and left the end rough, so I flatted the last coil and cleaned it up.
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