Mann recently told a realclimate reader that :
No researchers in this field have ever, to our knowledge, "grafted the thermometer record onto" any reconstruction. It is somewhat disappointing to find this specious claim (which we usually find originating from industry-funded climate disinformation websites) appearing in this forum.
Two archived versions of Crowley  contain such splices – one spliced in 1870, one in 1965. Mann et al. [EOS 2003] used the 1870 splice in their spaghetti diagram. Jones and Mann  used the 1965 splice, noting that this replaced an "incorrect version" used in the earlier study.