Grumpy2, Well that £149 one you link to has the jack the correct way up and it pushes the spigot down. On mine the jack is upside down and the spigot is the actual ram of the jack. However I see your point so it will depend on how well located the frame that holds the base of the jack is. In general I've not had a problem with the ram being pushed sideways but one does need to be careful to get everything vertical and have square ends on any pushing pieces you use. I have a lathe so that last point is not a problem. For general bending and straightening things I do not see a problem and those sheet metal bending tools will be OK. You just need to be sensibleabout things, if it starts to go sideways then stop.
Cheers
John.