I have copied this from Spakeys original thread info.
This should show you what to do.
The modification is to add an adjustable 'stop' to the release pedal to restrict the amount of movement and hence the rate of decent.
What you need is long bolt with two nuts (I used a 1/4" coach screw about 2 1/2" long), a drill for a clearance hole on the bolt
and a few basic tools.
Looking from the side, mark a position on the pedal vertically in line with the centre of the frame cross member
Remove the 'P' clip and pivot pin holding the release pedal.
Drill a clearance hole through the pedal at the marked position (on mine it was in the middle of the forth serration from the end).
Assemble the bolt with a nut either side of the pedal and re-attach the pedal to the lift.
Adjust the bolt so that the head is about 1mm from the frame with the pedal at rest.
Now, when you put you foot on the pedal it will move down to the 'stop'.
You should be able to adjust this movement so that the lift descends at a slow controlled rate.
I used a dummy weight on the lift (four bags of cement) to get this about right before trying the bike.
Works a treat.