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Yes, the loose hardware was a big problem with link and pin couplers in addition to the widely known safety hazard.  Another problem was that link and pin couplers generally had a lot more slack than Janney couplers.  Unlike Janney couplers, link and pin couplers were not as capable of transmitting a shoving load.  So the solution was to equip cars with “deadblocks” on each side of the link and pin coupler.  To the best of my knowledge, however, deadblocks were not universal during the link and pin era.  When shoving, the deadblocks came together and transmitted the compression force, leaving the link and pin coupler somewhat slack.  Link and pin couplers were well known to amputate fingers or hands.  Deadblocks smashed torsos.
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