I put mine together before I knew I needed this dimension.
I could dis-assemble and measure, but I thought "Why not try here first?".
Thanks in advance.

Same as a 1.7 .................. The Cap'n, right answer, first time, every time! Sorry,. Marty, there aren't any con rods laying around the house .............. The Cap'n

Thanks anyway Cap'n.

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126mm
TunaCan T4 Site

Thanks, Mark