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Hi mojo ,
I posted some pics of my homemade wooden wedge on IIS over 2yrs ago.I made it out of 38mm thick plywood that i fabricated out of two 19mm sheets glued and nailed together.I think wood is a good medium for a wedge as it damps down vibrations . It has been set up on the pier as shown for 2 yrs and has not been adjusted in the meantime.I use it for astrophotography and have managed up to 2-3 minute unguided shots at f.6 within the limitations of the drive.Some pics are therefore pinpoint and others show slight trailng due to periodic erreor in the drive. However it does demonstrate that wood can sucessfully be used.By the way it cost me about $20 to make all up.See pics below.
regards philip
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