Try top nut & pinch bolts out first .
The Sliders can work like a slide hammer
and pull legs down .
If archeological in the Joints , wack the top clamp of , remove lower & legs ( or Stauchions ) as assembly ,
then stare it out and lecture on ancestry . After applying C.R.C. liberally a few days before attacking .
Can pay to kick loose all bits before undoing any , if its cooperateing .
or All the nuts loose and a strop down a bumpy cobblestone / washboard road . ( wear a good helmet , & gloves )
Should all be straightforward actually . But Large Nylon Mallets , wooden drifts , and a Gas Torch are profesional .
The air turning blue & throwing things are most disconcerting to more timid bystanders .