Sometimes when you’re brim fishing over moss you need a semi-weedless fly to “tick” the moss on the retrieve.  The bentback spider or weedless spider is oftentimes the ticket.

Take a aberdeen hook and bend it slightly.  Too much bend will make the fly twist.

add some sparkle yarn or chenile

right at the bend add legs; you can use 2 or 3 on each side.  I use 2 generally because its easier than 3.

Take a small tuft of squirrel tail and tie in just in front of the legs, extending past the hook point.  Build up a thread head, coat head with sally’s and go fishing.  Secret to success with the spider is to fish it slow; cast it out, let it slowly sink, and twitch it ever so slightly.  If youre fishing with a floating line and leader with tippet, the twitch will cause the fly to rise in the water column; then let it drop again, slowly.