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Double Bass Fishman Full Circle Upright Bass Pickup UNC 1/4-20

I installed my easily enough. Before removing the bridge, lay your bass on its back and place something heavy but soft (I used a sack of flour) on the belly to prevent the soundpost from falling.

Also, I find it helpful to mark the bridge to tell you which side faces which way, which feet go on which side and in which direction. To an untrained eye (like mine), not always so easy to determine.
 
Make sure the adjuster screws on the FC are the same size as your current ones, if they are smaller, you won't get enough pressure to make a good sound and they'll buzz, if too large you'll need to have the holes bored out and that's a pretty high level skill set.