I have found that ebonite feeds tend to be brittle, so my suggestion would be a knock-out block or one of the many hacks mentioned in this thread and within the forum. Pliers and teeth also tend to leave ugly, permanent marks on the nib and/or feed. A rubber-tipped set of pliers (section pliers or spark-plug pliers) work better, but only marginally.
I found - to my detriment - that brute force (the pliers or teeth kind) might just work on plastic feeds, but it is an iffy solution when it comes to ebonite feeds. I managed to completely destroy the feed on my custom Ratnamson Supreme (my precioussss!!) using a pair of section pliers, but was lucky because Mr. Ramanamurthy had enclosed 2 additional feeds with the pen (did he foresee this?). Also, in my opinion, a bit of heat using a hair-dryer works well for anything to do with ebonite feeds.
Purchasing a ready-made knock-out block takes a bit of money (around $20) and making your own DIY knock-out block takes a bit of effort, but it is a real boon when dealing (especially) with Indian pens that have ebonite feeds.
So my suggestion would be a bit of heat followed by a knock-out block (or equivalent). My experience, of course, and YMMV.
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