power disc help

[bmx xxx]

right i might be being a rit nood, but want to fit a power disc set up, to my redline crank arms , the redline chain ring has a little extra hole where the crank arm fits nicely instide the chainring, but on the power disc it sits outside the hole, trying to explain, or do i need a different power disc, cheers

[dj_benice]

chainring adaptor vert ego has um

[bmx xxx]

not for the spindle but for the arm , where the crank arm bolt does up,

[GREMLIN]

You're going to have to fit a spacer of the right size in between the face of the power disc and the rear of the drive arm boss.    G.

[dj_benice]

machine the power disc hole to match the redline sprocket........

[bmx xxx]

where do i get them? cheers for the advice