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Read the article OSA Nymph here
Different sizes
Backswimmer
Step 1 - tail, rib, herl
Step 2 - weight
Step 3 - wrap herl
Step 4 - rib
Step 5 - thorax
Step 6 - wing case
Step 7 - separate herl
Step 8 - pull down
Step 9 - ready to trim
OSA Nymphs
OSA Nymphs
Nymphing
The originator
Korrie Broos - Wikimedia, Piet Spaans