A good wee fly for rivers, fished on the tail it has been my go to spider on the Gryffe & other rain fed rivers.Best as a Spring fly & again at back end. I dispense with the weighted body though & on occasion I use a Woodcock neck hackle & find that Tutta like that as well as the standard dressing. All in all a good we flee & one river anglers should have in their box.
Tight Lines
Meant to say, one thing I found useful & whilst I can not prove it adds to the fly attractivness is to use a whip finish of bright orange thread such as the UTC 70 at the head (got to find a way to get rid of it

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Tight Lines