A good reliable feedergum or powergum with the right combination of friction, elasticity and strength is a very important key element in the practical functionality most of your release rigs.
For the seatrout release rigs the Drennan 4-10 lbs feedergum (powergum) is the perfect choice – with thousands of hours of practical fishing with release rigs to proof its outstanding properties for this specific purpose. 4-6 lbs are used for fly rigs and 8-10 lbs are used for lure rigs. If you make a very tight 5-turn stop knot with this material on a fluorocarbon trace, the semi-fixed anchor point you obtain can without problems cope with a hard casting acceleration on both bombarda and for lures up to approx 30 grams. Another advantage of using powergum stop knots as semi-fixed anchor points – or adjustment points – on your rigs is, that if it´s damaged, it´s very easy to replace without having to rebuild the rig. If a float stop is damaged you often need to rebuild the rig – or to substitute it with a powergum stop knot.
The disadvantage of using powergum as a semi-fixed stop it that it´s harder to get a proper grip on the knot with your fingers and move it – compared to a float stop. In order to work correct the knot must sit so tight, that you can only move it on the fluorocarbon with the corner of your thumb nail in a powerful, but controlled pull. This is not that hard to learn, but its easier to do with a float stop as the semi-fixed anchor point.
Note that the friction of the knot improve the more turns you take. For non-bearing stop knots such as the ones supporting the position of fx the release clip – you can use 3-4 turn, but for bearing knots that must cope with the pressure from casting acceleration – such as on the anchor point of the rig – 5-6 turns is better.