Just trying to find things like washers online had been a nightmare for me before -- how can they list the external diameter and not internal, how can they not say what material it is, or the thickness!??
I ended up trawling a few local plumbing supply stores and was really surprised how few washers they had, about the fourth store had a few random open boxes they let me rummage through and we agreed a price. It was unexpectedly difficult.
I've found similar problems getting screws I want (for a ceramics kiln). Gave up and used the best thing I could find in Screwfix (which aren't that good).
I ended up trawling a few local plumbing supply stores and was really surprised how few washers they had, about the fourth store had a few random open boxes they let me rummage through and we agreed a price. It was unexpectedly difficult.
I've found similar problems getting screws I want (for a ceramics kiln). Gave up and used the best thing I could find in Screwfix (which aren't that good).