This article describes repositioning knees into sitting position in steps 1 - 3. the fourth step will be needed to straighten bent legs or reposition elbows.

Step 1

Cut wedges of plastic out from behind his knees. This will allow them to bend as if jointed.

Step 2

Take a straight pin, use pliers cut off the cap and trim to about 1/2 length.

Step 3

Use pliers to push the pin into the top of figure's knee and then push through into the knee joint. The pin will hold the knees bent for a permanent sitting position.

Step 4

If the joint is visible, you may need to fill seam with putty and may need to touch up paint.