1.This link is only springs replacement for MX switches DIY.
2.With springs,you don't need to change switches with desoldering.Just use a tweezer is OK.
3.The options when you order is all actuation weight.
Actuation Weight Bottom-out Weight
35g 45g (+-7 Error)
45g 55g (+-7g Error)
\u200b60g 62g(+-7g Error)
62g 67g(+-7g Error)
67g 78g(+-7g Error)
80g 98g (+-7g error)
150g 180g(+-7 error)