The FBS8.6 is very close to the FRW-8.5. When I took my PDD apart to fix
it, there was almost nothing left of the original belt, it turned into a
black goo. So I measured the pulleys and subtracted 5% from that length,
and took a best guess at the width. So far it's running great, it's
reading
For PDD-2 I used "FRW-8.5" from a random ebay seller. It's a generic size
code that several sellers list, so you just add "belt", to google "FRW-8.5
belt", and buy from whoever you like. I found the number in a old
archived forum or newsgroup post, a text file in the club100/bitchin100
archive
