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121 to 136 tunnel ext..

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just going to make a tunnel extension for my o3.5 blair morgan was wondering the lenght of the extension going to 136" dont have suspension in so cant just measure what i need but want to get tunnel finished any help would be great thanks darren

seen an old post of 8.5" any one have any diff ideas
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I posted the 8.5" and wouldn't go less than 7". It's really not that difficult. You're track will be 7.5" longer, so figure out where that will be on the ground and mark it, then grab a tape measurer and see how long your tunnel extension needs to be. Very simple to do.
I posted the 8.5" and wouldn't go less than 7". It's really not that difficult. You're track will be 7.5" longer, so figure out where that will be on the ground and mark it, then grab a tape measurer and see how long your tunnel extension needs to be. Very simple to do.
thanks for your help
darren
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