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It really depends on how you want to fish said pop up. If you want it critically balanced so it slowly settles on the bottom then you need to weight it so it just sinks. A heavy weight will make it sink fast and pin it to the bottom. I tend to use this route when fishing hard bottoms as I think it helps hook grab the lip. If you use a heavy weighted pop up on soft bottoms then there is the potential the hook gets dragged in to muck and masked. Then you have the arguement of the fish. A critically balanced bait acts more natural and will waft up in the water column as fish root about. Some wise old fish have been known to flank the bottom to see which food items move and which ones don’t. Barnwell mirror and the nutsey fish are just two of them.

Likewise. I have a little tank I use, it sits on top of the bait freezer. There's almost always something in there on test, either new rig components or new pop ups (usually pop ups, testing for prolonged buoyancy). Just this morning I checked in on a new pop up I've been looking at..... 12 hours in and buoyancy is perfect maintained, so far so good. Most off-the-shelf pop ups don't maintain buoyancy for 24 hrs therefore rig efficiency is compromised. Not a lot of people realise that. There's no way I'd rig one up without extensive testing at home first.

Well one of my most important pieces of equipment is my old 2L semi translucent ice cream tub ; this tub doubles as my refresh water container to splash over any Carp lying in my Carp Cradle , and my Pop Up tester . I am a putty user , it's a lot more fiddly than a weight , but you can fine tune the balance of your pop up ; I also like to wrap the Putty around the tag end of my last knot . I also like to position my Grip Stop opposite to where the hook barb ends . Oh , I'm a Ronnie Rig user . Hope some of this rambling makes sense , Smufter .

Didn't know anyone else did a scull cap apart from Trakker.... So with that in mind and considering they clip onto the brolly spokes, I doubt you'll find one that fits a bivvy..... Have you tried messaging the vloggers?