Installing Brompton front carrier block
 

After 2.5 years without a front bag on my Brompton, I got a great deal on an S-bag and decided to install the front carrier block on my S2L. I thought it would be a simple installation...until I saw that there are what appear to be two black plastic screws already in the mounting holes that I never noticed before. It looks like I need to remove them with an extremely tiny flat head screwdriver, but when I tried, the plastic screw heads started to get chewed up. I'm afraid if I try again, I'll completely strip the screw heads and will never get the darn things out. Any suggestions?

A bit of penetrating oil into the threads first? I wouldn't worry if the plastic gets damaged, so long as you can get them out.

Once you get the filler screws out , clean holes with solvent,
to remove the penetrating oil and any dirt, .. q tip.
then use threadlock on the bolts that go on them.

Yeah, getting the block on shouldn't be a problem at all, it's getting the plastic plugs out! I found a thread on another website, and the guy was having the same problem I am--the plastic just doesn't want to come out, and once you strip the top of the screw, you're well...screwed! I'm hoping adding a little grease will help, but those things are in there pretty tight.

Maybe, Take the fork out and screw them in further,
till they fall out the other side?

If they are plastic, a bit of careful drilling will get rid of most of the material. Or, drill a small hole in the middle of the plastic screw and screw in an "easy-out", basically a very conical screw with counter-clockwise thread designed to unscrew problem screws. As you screw in the conical screw counter-clockwise, eventually it bites firmly into the problem screw and unscrews it. I think they aren't cheap, though.

drill the plastic plugs superficially untill they melt alittle and free up? Done this to release plastic plugs on cars.

Depending on the kind of plastic they are, wouldn't a little solvent dissolve them?

I managed to get the plugs out, but it took a lot of trying. I ended up taking a sharp utility knife and deepening the slit on the top, then using a small screwdriver to pull them out very carefully. I've since put about 20 miles on my bike with the S-bag on the front, and I can't believe I waited so long to get one!! It's like riding a totally different bike...better handling, easy to access my keys/wallet/whatever with the rear pockets on the bag. Totally worth the $105 I spent on the block and bag :)