930 chain tensioner install question

[Silverbullit]

Motor assembly continues. (1967 911). I bought/installed the updated idler arms, that are wider on the pivot than the originals. Accordingly, my understanding is that no 'spacers' are required when using the (narrower) 930 tensioners. But I notice 3mmm space between tensioner and idler arm. In other words, the idler arm has 3mm of axial travel. Doesn't seem right, or is it?? Thanks

[gled49]

That is normal

[Christophe Penard]

I'm facing with the same situation.
So it's normal but strange : it's for sprocket auto-alignement purpose?

So why adding spacer with the pre-930 idler arm?

[Flieger]

You want to let all the bits find their happy places.