Wait a second, the fiber spacer goes into the button? Maybe its different in the clone but I put it in the battery tube, I tried to find out where to actually put the damn thing on the net and I couldn't figure it out, even the website doesn't say anything but its a spacer between the battery and the contact. Can you link the video about wehre the fiber spacer goes? I can't find it anywhere.
There is another thicker spacer (mine is red) inside of the battery tube. Don't forget this one either otherwise the mod is likely to autofire (only made that mistake once). The first time I took apart my button I did not see the spacer (I figure it fell out and I wasn't paying attention) so I put the switch back together without one; but when I tested the venting by blowing through the top the venting holes were being 100% blocked by one of the magnets being pushed up into the venting ports by the other, so there was no venting regardless of if the switch was pressed or not. So I used one of the extra spacers it came with and now it vents perfectly.
I found this video helpful.