Dropping the forks isn't necessary. Yes it makes the rebuild easier but that job can be done in place. The hardest part will be keeping the forks still while you compress the springs. Just tie the bars to one side and you'll be good.
If you plan on replacing the cables too, then drop the forks. Having the headset off makes like easy at that point.
Thanks for the feed back. I would be real reluctant to use that style on a painted fork. The paint on my lambretta is not good, and I was going to try and change the fork links without taking the front end off. I’ve never done this before. Is it possible to use the standard spring compressor ( of which I also bought) to take the fork links out without taking to front end off. Thanks for the help scott