Caliper pad pin plug.

I have always had problems with the calliper pad pin plugs on my 2003 Silverwing, even though I always put corrosion inhibiting grease all over them, they are always very stiff to undo and I am always worried that one day I won't be able to get them out.
Did the later scooters have the same plug or did they change them for a rubber bung. I know that my Honda Blackbird has the same plugs and I heard that they were changed for rubber ones on the later models.

My front brakes have a rubber bung but the rear has a flat head screw. strange, I'm sure you could buy a couple of rubber ones to install.

Although when i do install the pad pin and the metal screw bung i am over zealous with copper grease to prevent seizing and do them up with minimal torque- Had to drill one out and use an easi-out once, so never again

My 2014 Silerwing has a plastic cap covering the pad pin on the front caliper, I just put a new tyre on so checked the brake pads at 22,000 mls. I found vasaline on the pad screw threads works as well as anything.