My ancient Beseler 4545 head has sprung a giant light leak. I opened the top lid to check some stuff and now the #%//<*?+ will not stay closed!! The plastic screw down bolts refuse to engage the hole in the case of the head. These bolts are a two piece, spring-loaded affair that I cannot make function. I suspect I am surely not the first person to become enraged at these little rascals. Your suggestions appreciated, other than plenty of gaffers tape to hold it down.