Converting to hinge - is covered in many older "how-to-do" gunsmithing type books. Making the hinge is fairly straight forward to file, shape, weld/solder and drill - install cross pin. The level of the fitting of the hinge into its slot pretty much up to the skill of the maker. However that prevents the floor-plate from sliding to rear to unlatch, so have to invent a latch. Gets a bit more involved to do that part - older Euro was an external lever along floor plate, can also drill / file, use small coil spring to make like a Winchester Model 70 latch, or an "Oberndorf" / Parker Hale style within front on trigger guard loop. I never tried but similar can be done on Enfields (P14 or M1917) as with a Mauser. Why, I suspect, that 1909 Argentine were so popular to cut up into sporters - one of the few factory Mauser military with a hinged floor plate, release, etc. already done.
Parker Hale rifles had hinged floor plates if they did not have detachable magazines. A moulding into side wall of magazine says part number was 98 / 124. I have two styles that I know of:
Can see lower one has the trigger guard is slimmed and tapered - is a wider band at front than at the rear. The mechanics of the latch seem to be similar.
The one with the scroll "engraved" sheep head came loose in a purchase (I think). The smooth floor plate one is from a Parker Hale 1200 TX. Appears identical to what is on what I think is a Parker Hale 1200 in 308 Norma Mag - I have great deal of difficulty to ID the various models of Parker Hale once they stopped engraving the model designation on left side of receiver.
These assemblies are very light weight - metal of some sort - they do not attract a magnet, so not steel. Is possible they are Zamac or similar die cast stuff - a "mystery metal", perhaps - almost impossible to weld that I know of, and I only know to paint them - no clue at all how to restore that anodize-like finish.
A view of what you get if the stock does not get some clearance for the hinge part to swing up - forward of the hinge pin - and then apparently pry or force the floor plate open anyways - is also possible that one side of this magazine was also epoxied to the wood stock when a "bedding" was attempted, at the same time. Beyond repair, so far as I know - the front of the "tongue" with the part for the front action screw, was not with this, when I received it.
