Sandy, be careful about this point. Usually, piston pin bore that are designed to fit spirolock are without notch (see picture). As you can see in the pin bore, these are several screw driver impacts . It is not easy to install but it is difficult to remove it! When you will remove one F@#$% you have to check if your piston pin groove is provided with a square section (for spirolock) or with a round section (for traditionnal pin clips). Check also your piston pin end that is provided with or without external chamfer (external chamfer is for traditional pin lock). It is not recommended to change the initial design.Mr. Mac -</P>
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<P>The pistons do have a notch in them in the pin bore. Just didn't have the right hacked tool. I'll will bend one up and see if that does the job. What ever happened to the user friendly Tru-arc's </P>
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<P>I guess the tool didn't work and is why it can't be found anymore...</P>
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<P>Sandy