Advice, words of wisdom requested.
I’m in the middle of doing a major service.
TB replaced;
Cams pinned, old belt marked with dots against cam gears, teeth on belt counted and transferred to new TB. New TB fitted, cams un-pinned, crank rotated and TB tensioned against blue mark on pulley. All happy.

End covers on, engine remounted, re-check on valves, and rear cam cover on.
About to fit front cam cover and slack now apparent in TB between Inlet and Exhaust cams on the front bank. TB no longer drum tight/ tappable.
So, all unhappy and HELP!

Is this slack normal, when the crank is aligned with the blue mark this is described as ‘maximum tension’, presumably therefore all other positions are at a lesser tension, is what I observed a manifestation of this.
Trying to think of a good reason not to re-expose TB and repeat the process.
Duncan