Hi Warren. Forgive me but I'm not quite clear - were none of the LB rifles' pads soldered from 'new' or were the later rifles soldered in the factory as part of the T conversion process? I may have misunderstood your earlier posting.
I've only had about half a dozen LB 4T's apart (those from the batch) & they all showed signs of both pads being soldered........but then again they were all rifles that had seen UKservice. Several had also been suncorited over the original blued finish.
Oddly enough I soldered a set of pads back onto a BSA 44 4T only last night. Managed to do it with very gentle use of heat & spared the suncorite, too. The screws will just need a blob.....