T&T: prop shaft lock

[badornato]

what is the best prop shaft lock?
two monkey wrenches?
yesterday while being towed across the bay by vessel assist with my dead
single lehman, i was getting nervous about spinning the transmission with
the engine down.
on sailboats we always put the trans in reverse to stop spin while sailing
with no apparent ill effect over years of sailing

what do twin engine boats do when running on one engine to stop prop shaft
spin on the down engine?

-- 
bruce adornato
amelia
kk42
sf