... I have used several different furled leaders, largely based on circumstances, for nymphing.

My usual furled leader is a thread furled leader that submerges. It is intended for dry fly fishing, but sometimes I'll just add an indicator and go with nymphs. My preferred indicator the past couple years has been a thingamabobber, and the smaller ones when using a thread leader, which is fine, because I'll normally be fishing smaller nymphs in this situation. If I need fresh tippet, I'll change out from mono to fluoro for the nymphing.

If I plan to nymph fish only with smaller nymphs, I'll go with a furled fluoro ( 2# Berkley Vanish ) leader, which is just like my thread leaders - finished length about 68", a 10-8-6 configuration, with 40%-30%-30% proportions and a tip ring incorporated. Add an appropriate length of fluoro tippet and an indicator and it's good to go. The preferred indicator will be one or two of the smaller thingamabobbers.

For larger nymphs ( think heavily weighted size 2-4 or thereabouts stonefly nymphs ), I've been using the same basic leader but furled out of 4X Rio Extreme Tippet, tipped with either 2-3X mono or fluoro. This set up, either single nymphs or a tandem, takes either two of the smaller thingamabobbers or a large one.

John

P.S. When using an indicator with a "loop" like the thingamabobber, the best way I've found to attach the indicator is a simple overhand knot. This works okay with mono leaders, but does tend to leave a kink where the overhand knot is made. With the furled leaders, the overhand knot does not leave its mark. Simply thread the leader through the "loop", slide it up the leader to the desired positon, and form the overhand knot. The overhand knot keeps the indicator in place, and it is quite easy to reposition the indicator by loosening the knot and moving the indicator up or down the leader.