You are not saying the type of flies you are tying or how you are using the Marabou?

Without that it will be hard to advise you well. You can tie it in by the tip and wrap it on the hook then Back rib over it with 6# Mono or you can us a little Super Glue on the base and wrap the feather over the wet glue. Just not sure what flies you are tying and how you plan to tie them. Ron