Off the back of my last question, is there any way i could be able to add some progressiveness to my suspension, maybe i could retrofit tokens or something of the like.
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As @alex commented you need something that takes up some air volume. Around 10 years ago in the downhill racing scene this was also needed by some heavy riders. The solution was to pour some fork oil into the air chamber to make it take space there. The oil will also eventually get into the negative air chamber when the fork is compressed to the groove on the inside, so the characteristics of the fork will change during a single descent.
The only other solution that comes to my mind (actually it is a bodge) is to use Formula's Neopos volume spacers, and just squeeze them into the fork (its air chamber). Those are foam-based and it might work.
But I think you are better off buying a fork capable of taking proper volume spacers.