As you take apart a Parker shotgun, it is wise to remember the
screw placement and one proven method to guarantee they go back
where they came from is to use a stiff paper or wood block
pattern, with holes arranged to mimic the screw arrangement for
the right, left and bottom sides of the frame. Then as you
remove any screw, place it in the paper or wood screw hole which
corresponds to its original placement in the frame. Then, when
you reassemble the frame, you will easily know where each screw
belongs. Correct placement of the screws preserves proper screw
slot alignment; which is always at right angles (either up &
down or right & left).
If the screws are not aligned properly, the first thing to do is
make sure they are in their proper locations. Typically, the
screws on the left side of the receiver are commonly marked with a
"-" on its tip and nothing on the right.
The floor plate screws can have different combinations of screw
length; the early
guns have two short screws in the bottom of the frame and one longer
screw at the frame's rear, which is partially covered by the forward bow of the
trigger guard. Later guns often have three screws of equal length
On the early type, the "-" mark is on the left side
screws, and the right side screws are unmarked. On floor plates,
the same convention applies with the "-" on the left
screw, the longer screw goes to the rear/center and the other
short one is on the right. On the newer type with floor plates
that have three screws of equal length, the rear-center screw
carries a "+" mark and all other screw marking
continue to adhere to same conventions as earlier guns.
The "left side" references the
left side of the gun while looking at the top of the receiver
and with the barrels pointed away from you, or in other words,
on the same side as the left barrel. When the gun is
inverted remember the left side becomes the right.
When installing these screws, insure the screw is in the proper
location, and all the threads and channels are clean.
These are general guidelines, there could be other variations.
If the above advice doesn't help, you can just experiment with
different placement to see what gives you the best alignment.
Remember to always use the proper screwdrivers when working
with any Parker screw to keep the screw head from being damaged.