Hi Steve, yes I have been there and yes there is an issue with the Volvo fixed props as the bolts are not retained other than loctite 243.
If this is not applied to specification, and you jam a length of wood between hull and blade to tighten bolts, the risk is clear. However the newer Volvo folding 3 blade has retained bolts so far less a risk, the older Volvo 2 blade folding prop was very bad as you had to Align a blind dimple up with the retaining bolt, very hit and miss, lost one of those as well, long time ago.
Also the retaining bolts for the anode are difficult to tighten, I use hexhead bolts as photo.
My rules are, clean, dry, apply 243, rest for a few hours.
Hope this helps.
Odysseus
Bav 38