Hello and welcome, Until better info comes foreward, by an owner, I found this below for a similar model,
and it looks as if there are plastic parts making up the rise and fall.
The wheel for this is part 13 and the firs suggestion is to see why it won't lock the blade and I see there is a grub allen screw which may need a tighten.
If you could post a pic, after, I believe you have 7 posts it will probably be easier to help.
http://www.manualslib.com/manual/613843 ... e=2#manual
There are 13 pages, or perhaps you could find the HG manual by googling, or jeeves etc.
How long have you lived at Tomar? I worked in espinhal, near Panella, north of you on n13 I think. which i see is about 80k from you.
My Father in law retired there years ago and bought some properties when prices were lower than now.
And I worked there for some time on a water mill conversion which was my first job.
The food, weather and vino de mesa were really good!
Regards Rodders
