Power tube spacer on classic valve - loose?

Is it normal for the spacer in the power tube on a classic valve to be a bit loose when everything is put together?

I recently re-built a valve, and I can hear the spacer rattle around slightly in the power tube when I shake the valve. Its clear when I tighten the power tube tip there is no resistance from the spacer and that it has some wiggle room between the power tube tip and the o ring.

Is that normal?

The valve appears to fire and function fine.

As a test I tried all the spacers and even the longest still rattles. I'm a bit confused as I thought the point was for the different sized spacers to apply more or less pressure on the power tube o-ring.


Thanks for any insight :)