Yeah use sand bags I was doing about 15 kilos.
If you are in the consolidation face then you must really hurry up.
The more you keep your knee straight the best.
You ask about how many sets of times you should you do it a day. The anwser is easy budy. As much as you can resist. That's just the true. You should have this problem only during lengthening not during consolidation. Many doctors only look your knee and make a decision base on that. But it is necessary for them to look at your side x-ray that's the best way to see if there is a knee contraction. I developed some knee contraction, but it was hard to see, you could only see it on the x-ray. If you have ilizarov it should be fixable by turning the back rods and turning back the front rods. The worse part of knee contraction is not not be able to stand straight, it is that you might develope arthritis In the future ((((( keeping your knee straight sucks ive been there!!!! Now I ask you, like someone said keeping your knee straight all day is not way to live even for few months, well the other option is risking risking arthritis in the future for the rest of your life. So it's your decision. You signed up for leg lengthening im sorry.