Hey Anji,
As the others say, it is a nice looking job you've done, good competition for a10gf...! You've probably already figured this, but a suggestion for when you dismantle the units (if not already done?),to contain springs from exploding, as you slide out the main column/shaft, replace it with a length(needs to be ~350mm,to exceed free spring length) of threaded rod and BIG 1" +hole washers on each end to contain spring assembly. Maybe slide the shaft up first and put bottom washer in, then the T.rod can go down inside the shaft as it goes out the bottom, then wrestle unit out of frame and unscrew the nuts to slowly release the Sp. tension....something along those lines anyway,but keeping one nut close to(bottom?) end of T.rod , I hope you get the drift. good luck, duTch