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There's not that much you can do really is there.
The metal part with the timing marks can only go on two ways.
If you have lost the position of this bit and you haven't changed the timing chain position then you can find TDC by looking at the cam lobes on #1 cylinder or by using the little mark (notch) on the camshaft as a guide to where TDC should be - there's not fine adjustment at the crank - just two dowels so you'll be fine there.
Another simple check for TDC is to remove a glow plug(s) and turn the crank by hand and feel for when air is expelled from the cylinder. You'll get to a good approximate position for the dowel pins...
If you are worried about the metal and rubber disc part then I reckon you'll probably be OK fitting that to any of the bolt holes. However, if you are paranoid (like me) you can quite easily check for static balance in the following way =>
Obtain a pipe / round bit of wood (rolling pin from the kitchen?) that will fit through the disc. Use grease if necessary to get it to spin freely.
Spin the disc - put a mark on the bottom of the disc where it stops.
Spin the disc again - put a mark on the bottom of the disc where it stops.
Repeat until you get bored!
If the disc keeps stopping at the same point then it is safe to say that it is not neutrally / independantly balanced.
Ideally you should find that the disc stops at random positions - this means that there is no out of balance "weight" causing it to stop in a particular position - the disc will then be deemed to be statically balanced.
In my opinion this check is more than good enough for your problem.
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