Here is the fly pattern sheet for the BWO Klinkhåmer Variant.
Daiichi 1160, #16 – 20
16/0 Veevus Olive (A05)
WapsiTurkey biot – BWO
Peacock herl, 2 strands
Here is the history of the Klinkhåmer Special from Hans van Klinken in his own words posted on the website by Tom Sutcliffe called – The Spirit of Fly Fishing – in April 2012, the 25th anniversary. CLICK HERE