Rebuilding a shock...doable at home?

I have a pair of older Aldan street rod shocks that are pretty soft. They have a lifetime warranty (for original buyer) so I asked how much to get them rebuilt. $70 for the pair so I dug a little deeper and took one apart. As far as I can tell , there is one friggin O-ring in there! Around the piston...now there are a few seals but they didnt leak before so I'm gonna replace the 1 O-ring and see if it tightens up. They have a knob on the upper mount to adjust damping. They are too short for the rear of an A so Ill probably just sell them. They seem to be old Ford street rod fronts.

should be some sort of valving disc i it some wheres! got a buddy that rebuilds shocks for the dirt track crowed round here, 70 bucks dont seem to bad for skilled expert rebuild...

Are you going to reuse the hydraulic fluid or replace it?

"Rebuilding" a shock is more than seal replacement. You say that the shock is "soft". On compression or rebound? This is the time to correct this. This involves having the proper check valves/springs or washers to adjust and then using a machine to measure the difference. If the shock is not leaking and you plan to sell them, why are you "rebuilding" them.

These are 'soft', can compress them and extend them by hand 6" in about 2 seconds each way. Would you wanna sell or buy a soft shock? The oil is saved in a bottle an one is untouched. I have some new shocks and I can barely compress them an inch a second. Perhaps these valves are shot. I have not really checked them out, just observed there is one O-ring in this model.