Yesterday I put the engine back into the frame.
It was not an easy task. But with the prop-stand, some support to the rear, the shock in place and a couple blocks of wood under the cylinder head I was able to nock the bolt through.
It was my third engine bolt though. By using a big hammer without a drift I ruined the threads on both my original one and the casa Lambretta one. Expensive experience.
I went for the Escort shock. I found it a good compromise between quality and price. I have an Escort shock on my other Lambretta too and I’m quite pleased with its performance.