Rust. Lots of it.
Down in the Barn we deal with this. 40 years of sitting in Swedish woods turns tin to thin, with added perforations..Give Dai a shout on 07866618267 to chat early busses, or email firstname.lastname@example.org
On this site you'll find some random pics of the stuff that gets worked on occasionally inbetween day jobs, trips to the pub etc...
Latest barndoor playing video here!