While cleaning my Buccaneer playfield last night I finally determined the source of all the white dust that’s plagued me over the years. Old rubber rings on the dead bumpers! I had no idea that they had rubber rings but quickly remembered the two rings I had leftover from the kit I installed years ago.
Anyways, came across this thread after trying to figure out how to replace them. What an engineering FAIL! Having to desolder them from the playfield almost guaranteed that they would not get replaced on a regular basis. They could have easily made a two piece bumper design that could be disassembled on the topside.
In any case, I followed the recommendations above to do it right and in less than an hour I was back in business. Would definitely not recommend trying to split the ring or stretch it over the top.