Question about how to talk nitro

[MetalMan]

Pretty sure linc is right on this one - basically it's just a matter of creating a tighter fit between the piston and sleeve to increase the friction (and thus compression) between the two. Cheaper than a rebuild so it saves money, and you can vary the level of "pinch" as a way of controlling how tight an engine runs.

[FG101C]

I've heard of people attempting this with a hose clamp.