I decided to try an old strap on my silver dial 25770 Offshore that I had not mounted before.  The strap was used and came with one of my very first 25770 acquisitions.  Based on when I bought the watch, the strap is likely 8 years old +/-.  It is an original Audemars Piguet gator strap in a mustard color.

So each side of the watch case has two screws and 1 bar.

You don't realize how heavy this hunk of steel is until you have removed the strap and hold it alone.  Really an impressive mass.  Next time I have it separated I'll see if I can throw it on a scale.

If you have never seen the caseback... pretty typical.  One minor side effect of using the kevlar strap is that it can cause some minor scuffing and blemishes on the brushed caseback.  Certainly this does not bother me.  Some of it occurs over the stitching that holds the leather patch that the watch sits on (you can see that area a few photos up).

For attaching the new strap, you have to hold it against the case and then feed the bar through.  This photo shows the bar partially inserted without the strap; the bar needs to be out of the way to align the strap and then gets pushed in.

Same thing here - you do not put the bar into the strap first, but I snapped this shot to show how little the bar will extend into each lug when properly centered.