DO SIMMDOUBLERS WORK?  (4.4)
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       Sometimes.  Problems have been reported so make sure you get a 
  money-back guarantee before ordering.  MicroMac's SIMMdoubler II 
  will double the SIMM capacity of all Mac II models and the Performa 
  600; i.e. it lets you fit two SIMMs in each slot on your logic 
  board.  It also lets you use standard 4x8 SIMMs in the Mac II and 
  IIx rather than the more expensive PAL type normally required.  At 
  $140 street a set of four is a little expensive but perhaps worth 
  it if you have a let of extra one meg SIMMs.  Sermak Technology's 
  (800-209-7126) SimmStacks will fit two 30 pin SIMMs in one 72 pin 
  slot.  Sermak also sells SIMM doublers that fit two 72 pin SIMMs 
  in one 72-pin slot.

       Since the extra height of the SIMMdoubler provides more 
  leverage to exert force on the SIMM sockets, some users have 
  broken SIMM slots when installing these products so be careful.  
  Furthermore if you use more SIMMs than you have sockets, you'll be 
  drawing more power into them than your Mac was designed to supply 
  which might lead to problems down the road.