Combo Starter Motor, Where's the top bolt?

I just replaced the starter motor on my 2005 1.3 diesel Combo van.

I raised the van by around 8" as I need plenty of underside clearance.

I then moved the radiator expansion bottle a few inches and the fuel filter even less.

Apart from a couple of multi-pin electrical connectors I didn't disconnect anything.

The top bolt is down inside an oval hole exposed when the oval rubber grommet is removed from the clutch bell housing. The head of the bolt can be seen with a torch & mirror.

I located the top bolt by probing with a T45 bit on approx 6" long extension and a 1/4" ratchet wrench.
Warning: If making up your tool with more than one item then use sticky tape to keep them stuck together. The dropping off of any bits (or the screw itself) then it will be a gearbox off job to recover it/ them!

I cracked off the bolt just one turn and then switched to the underside.

With the battery disconnected I removed the two wires from the starter motor solenoid terminals.

I then undid and removed the lower bolt.

The important bit: With an assistant undoing the top bolt I pulled the starter motor backwards until it disconnected from the thread. The top bolt was held forward in its hole at all times.

On fitting the new motor I pushed it up against some resistance from the top bolt / assistant.
At the same time the top bolt was rotated by the assistant. Eventually the bolt engaged and further rotation pulled the starter motor up into its final position.

The bottom bolt was fitted and done up fully and the 2 electrical wires reconnected.

The top bolt was then fully tightened.

At no time was the top bolt allowed to move backwards more than a couple of millimetres or so!