I was trying to remove a drop-arm from a Landrover Defender steering box.
Should have known better.
No substitute for good quality tools.
Not Impressed.
Draper 10T Hydraulic Puller
It broke.
Then I spent a lot of money and bought …
Sykes-Pickavant Hydraulic Drop Arm Puller ( 1500 Series Ram )
And of course it works.