Hello dmaiden ,
Yep ,those are the vent operators by Hehr ,they can be hard to loosen .One of mine never unfroze ,blaster ,WD 40 etc ,for weeks soaking still no way .
finally had to get it apart ,and did ,but the square part that the handle pops
onto is now detached from the inner piece ,don't know how to fix it yet .so
be extra careful to go easy on the loosening .I knew this one might come apart too far on me but had to do it .If others know a solution for this Id
also appreciate some advice .
scott of scottanlily