I had exactly the same problem installing a new plastic set onto a Flight 2000, fortunately Classic Playfield Reproductions have issued a guide as to how to do this.
You will find it here.
http://www.classicplayfields.com/f2khelp.htmlI found this technique worked perfectly well. Yes it does involve drilling to remove the metal "Bells " and will require you to file down or grind the burr off so that it can then mate perfectly flush with the plastic and of course it will not now be rivetted to the new plastic but I found this was not absolutely necessary as once the new plastics set is installed it wont need to be removed again for a long time.
One of the advantages of doing it this way is once the "Bells"are removed they can easily be polished. Mine were very dull and lacklustre so I got a small piece of dowel ( about 10 or 12 mm I think ) and then sanded it slightly so that it was a firm fit on the end of the "bell". Then you put dowel in you cordless drill, put the bell on the end and hold a polishing rag with a few drops of polish on the end and effectively spin around the bell in the polish rag for about 10 seconds and then do it on a clean rag, Believe me the "bells"will look brand new afterwards. To polish the bells while they are still rivetted onto the plastic is not easy and will take forever and it will weaken there attachment onto the plastic. This took about 30 minutes to do about 30 bells.
In that CPR guide Kevin mentions getting new screws to really make it shine. That is also a good idea, I went to a local fastener place ( West Coast Fasteners ) and got all new stainless steel screws in the correct size and length and it was pretty cheap , it worked out about $10 - $15 for all new screws and nuts, way easier than cleaning the old ones some of which were rounded off.
Hope this helps you.
