@kushkush I've been using hemp fibre for concentrates.
Lay whatever you're using on a piece of hemp. Kief, crumble and crystals in this case.
Keep the contents in the centre and roll the fibres around them.
You should end up with a small ball which can be placed in the tip.
I tamp it well back so nothing gets scorched by the clicker, IH heat source.
Vape until done, there has only been evidence of the kief left behind when I've inspected the hemp afterwards. The dark spot is the fine particles of weed in the kief.
No sticky residue from the crumble or crystals.
A couple of times I've re-used the hemp to see how much it degraded and I seem to recall 4 uses being the most times I've tried the same piece.