Never feel daft asking... I've gained a massive amount from asking questions on here for the last 8yrs.
Re spacers see my thread 3yrs ago and post #22 where there is an image of the plastic spacers I made.
http://www.rib.net/forum/f50/trem-hd...tec-69303.html
I know the OE spacers when new have a shaping that is to help the legs snap into position but I found by bending the brackets and leg tabs as I mentioned above you could quite finely set how firmly they engaged.
The other point is there is massive flotation in those tyres and that upward force helps stick them in the launch posn when trying to flip them up... if this is a problem you could consider what I've done... fit sandhopper wheels which have negative buoyancy. Never drop them in deep water though!
See this thread below... my post #24 for the sandhoppers and #30 for forum member Paddlers solution.
http://www.rib.net/forum/f50/best-wh...els-72495.html