Push the engine block in place using the marked engine casing. Press in up to the marked pencil line.Remove the casing.
The reason I went into such detail is because I disagree with most instruction sheets. They'll have you spread glue 1" from the end of the tube and (hopefully) push the engine block into the correct position.
If you put the glue in too far below the final position of the engine block, you run a bigger chance of the block being stuck in the wrong position.
Take a few extra moments getting everything ready beforehand. Too many rockets have been ruined by a mis-positioned engine block.
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