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Bushing for Harrells tuner / update..mounted one up 😎

I have a Harrells barrel tuner coming for a .719 LW barrel on a RAW. The Tuner comes at .750. Difference of .031, so I think I need shim stock /bushing of .015 x ..719 or flat stock of .015 x 1.438 length .? where would I get such a bushing made up ? or could I just use flat shim stock & wrap barrel end at muzzle. I think these Harrells tuners slip on about an inch over muzzle. ? I called Harrels before I predered one & they said just have a bushing made up. There minimum is .750 so no changing that.
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I have a Harrells barrel tuner coming for a .719 LW barrel on a RAW. The Tuner comes at .750. Difference of .031, so I think I need shim stock /bushing of .015 x ..719 or flat stock of .015 x 1.438 length .? where would I get such a bushing made up ? or could I just use flat shim stock & wrap barrel end at muzzle. I think these Harrells tuners slip on about an inch over muzzle. ? I called Harrels before I predered one & they said just have a bushing made up. There minimum is .750 so no changing that.
The last time I talked to Harrell’s, I was told they would make a bushing to fit my barrel.
 
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