Hi Mandy
This is quite a common problem
Basicly as you tighten the bolts up it can distort the frames and make them feel very unstable
I did a tutouial about settting up the stilts so it might be worth you having a look
It is about adjusting the stabiliser bars but the string and rubber band tool will help you see if your bocks are out
If they are out try loosening all the bolts you undid to change the springs (including the small ones that hold the spring to the brackets)
Them pull the bock back into shape and just nip the bolts up untill they are tight but not to tight (you can adjust the bock but hand when they are like that)
Once the stilts are true tighten the bolts
This should get them back to the right place
Then adjust your cuffs
This is a personal thing but I find that when I first put them put on and walk you can feel likr you are falling off one side of the bock
If the stilts are true and straight this will be due to the cuffs
Simple rule for adjusting cuffs move them towards the side you feel you are falling off (yes it sounds wrong but it works)
So to clarify if when you walk it feels like your right foot is falling outwards move the cuffs outwards and this will move the hoof the oposite way and ballance you
Hope this helps as I know how off putting it can be when they feel wrong
If you are in the london area come along to one of our meets and I can help you adjust them
Jason