When I had my slightly dinged prop replaced, I kept the old one on board (with floating spanner). On the basis that prop is probably most likely thing to be damaged, so no harm in having a spare to hand, and it doesn't take up much space.
when I upgraded to S/steel I kept the ally ones on board, nearly needed them once but the S/S ones munched up the hessian sack and I manged to launch the dinghy and frre the rest.
I always had 6 spare props on my corniche.
I had problems with volvo duo props, every 1000nm ish a blade off the 4 blade prop just came off with no other damage (no impact).
Some brand new props only went 400NM 2 months old.
Volvo never replied to me and no offer was ever made to replace any faulty props.
On a recent cruise to Paris by a well known magazine I was directed to a berth 6 inchs deep (thanks Tom!) That was one set gone.
I also had a spare prop nut after a cone and prop came off( there is a locking bolt that should be replaced every season due to the nylon lock within)
If you have volvo duo props I recomend several spares, my best time to date to change offshore is 18 mins.
I should point out these were Aluminium props.
Floating Spanner? /forums/images/graemlins/laugh.gif What happens if you drop the nut, or do you have floating nuts as well? /forums/images/graemlins/tongue.gif And what happens if you drop the prop? /forums/images/graemlins/grin.gif
I off load the submersible from my tardis like garage, and use the grabs to pick up the nuts or prop from the seabed. Next question /forums/images/graemlins/tongue.gif
I carry a spare pair of old ones refurbished by steel developments - nice job, both completed with postage for about £90. I am on the upper Thames so will put the refurbished ones on before next channel cruise then keep the others as spares (they get the odd dink from the occasional shallow mooring). So easy to change on outdrives, seems sensible to have them onboard.