With Octalink the axle is part of the bottom bracket, so you need an Octalink BB. You'll also need some M15 Octalink crank bolts.
Thank you for that prompt reply, and, the lead to Octalink bbs.
This in turn will lead to the proposed acceptor bike coming out of the garage tomorrow to assess the width of bb needed.
@mespilus started
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With Octalink the axle is part of the bottom bracket, so you need an Octalink BB. You'll also need some M15 Octalink crank bolts.