remove the 2 front screws completely.

slide the engine forward, giving access to the rear screw.

Tighten the screw a little.. slide the engine back again. check to see if the engine now forces the retaining bar up appx 10 deg when the engine is slid back. (if not... slide it forward and tighten the screw a little more)

Use pliers to gently pull the bar down so you can insert the front screw.