I don't have any crush gaskets, and can't wait for a shipment right now.
so I got some 1/8 copper tubing I found at the hardware store.
1/16 hole inside
Heat it with a fire or torch til red, then quench immediately
Grind/sand edges in a wedge and opposite wedge pattern ,
then bend around a scrap of handlebar (7/8)
Anneal again (heat/quench)
Plop it in and tighten and off you go!
I put the wedge side towards the head so it cant expand outward.
I needed it because I just finished modifying my hacked up combo pipe after derestricting it...
I hate those simonini silencers!!!! So restrictive...had to chop that up too.
With the restrictive pipe it hit the powerband, but no power anywhere else.
Now it finally has power in a much broader range.