The requirement for a maintenance record entry for assembling or
disassembling a glider was removed from the FAR's a few years ago. The
preamble text for the change (copied verbatim below by Brian) was
listed in the preambles for the part 43 change, I think around 1984 or
1986.

Bottom line, there is no requirement for a log entry when assembling or
disassembling glider wings, tips and tails.

Jim