Jeff, through then years, Leupold has varried their policy on such modifications, since the 36x is no longer in production, I have no idea what the policy is now. If you cracked a lens, which has nothing to do with the conversion, they might fix it.
Something like a broke reticle, since you have to remove it to do the conversion, might be another matter.
They will fix any scope for a cost.
The Tucker conversion is a worthwhile addition, it does fix a problem that supposedly plagued the 36x models, that being the erector tube shifting on the radiused shoulder that allows it to pivot. Cecil adds a o-ring on tube that keeps it from shifting ever so slightly in the radial.
The plunger spring is an afterthought, the flat Factory spring is really adequate. But that is the recognizable feature of a Tucker Conversion. Plus, it makes re-assembling the things a lot easier........jackie