Good advice Ronni but I believe my problem has been unsuitable screwdriver 
rather than seriously stuck screws.  The physical problem to take the iMac in 
to T4 is off putting!
Severin

On 25 Jun 2014, at 5:10 pm, Ronda Brown <ro...@mac.com> wrote:

> Yes that is correct... It is now 14 pieces. I've had my set for probably a 
> good 15+ years ;-)
> 
> If you are having trouble loosening the three screws, sometimes the space 
> between the internal threads and the screw threads capture moisture and 
> oxidation occurs. If this is the case attempting to remove the screws will 
> possibly strip the head. If this happens you will have to replace the screws. 
> If you are finding the screws difficult to loosen I would take the iMac to an 
> Apple Authorised technician and let them loosen them. They have more 
> experience and if the screws are ruined they will be able to replace them.
> 
> Cheers,
> Ronni
> Sent from Ronni's iPad4
> 
> On 25 Jun 2014, at 4:58 pm, Severin Crisp <sevcr...@westnet.com.au> wrote:
> 
>> I see that that Newer Tech kit is now 14 pieces
>> Severin
>> 
>> On 25 Jun 2014, at 4:38 pm, Ronni Brown <ro...@mac.com> wrote:
>> 
>>> Hi Severin,
>>> 
>>> Remember that the screws are captive - they only loosen, they remain with 
>>> the cover - so it won't be noticeable that they are unscrewed until the 
>>> cover comes off.
>>> 
>>> I purchased many years ago and still use today, a Newer Technology 11-piece 
>>> Portable Toolkit which includes:
>>>     • Three Torx screwdrivers (T6, T8, and T10)
>>>     • Two flathead screwdrivers (1.8mm and 3.0mm)
>>>     • Two Phillips screwdrivers (#00 and #2)
>>>     • Two nylon spudgers—otherwise known as pry tools, useful for opening 
>>> iPods or Mac minis or removing the top case from an older MacBook Pro.
>>>     • A set of large tweezers, perfect for fishing out the screw you 
>>> accidentally dropped into the innards of your laptop
>>>     • A scissor clamp for holding cables and other thin objects in place.
>>> 
>>> I would be lost without this little set of computer tools.
>>> 
>>> Cheers,
>>> Ronni
>>> 
>>> On 25 Jun 2014, at 4:17 pm, Severin Crisp <sevcr...@westnet.com.au> wrote:
>>> 
>>>> Thanks, Ronni.  All my reading came up with Phillips but unspecified size. 
>>>>  I suspected they might have been torx but definitely not.  I will go back 
>>>> to my selection and try again.  
>>>> Best wishes and thanks
>>>> Severin
>>>> 
>>>> On 25 Jun 2014, at 3:45 pm, Ronda Brown <ro...@mac.com> wrote:
>>>> 
>>>>> Hi Severin,
>>>>> 
>>>>> If your iMac is  21.5" Model A1311 or 27" A1312  you can use a Phillips 
>>>>> #2 screwdriver to loosen the three captive screws on the memory access 
>>>>> door.
>>>>> TURN them COUNTERCLOCKWISE
>>>>> Then remove the memory access door and set it aside.
>>>>> 
>>>>> Cheers,
>>>>> Ronni
>>>>> 
>>>>> Sent from Ronni's iPad4
>>>>> 
>>>>> 
>>>>> On 25 Jun 2014, at 2:08 pm, Severin Crisp <sevcr...@westnet.com.au> wrote:
>>>>> 
>>>>>> I have a Late 2011 iMac 12,1 and have purchased modules to go from 8GB 
>>>>>> to 24GB ( thanks Daniel).  Today I duly shut down, unplugged everything 
>>>>>> from the back (including a struggle as always with the ethernet plug) 
>>>>>> and laid the Mac out flat on a towel.  Various of the online “how tos” 
>>>>>> list the simple procedure starting with a Phillips screwdriver to undo 
>>>>>> the three small screws that secure the cover.  But not so easy.  I have 
>>>>>> several Phillips screwdrivers which look as if they are correct but do 
>>>>>> not catch.  Closer inspection shows that the screwheads have only a 
>>>>>> shallow indent so a normal Phillips, which has a bit of an extended 
>>>>>> point, does not apparently go in far enough to engage.  Not wishing to 
>>>>>> damage screwheads I put it all back again and still have 2 x 8GB sitting 
>>>>>> on the desk looking at me expectantly.  Has anyone else tried to follow 
>>>>>> this seemingly straightforward operation and had, or not had, similar 
>>>>>> problems?  Are they really Phillips screws or something that just looks 
>>>>>> like them?  I have had similar situations in the past.  
>>>>>> Advice please!  
>>>>>> Severin Crisp
>>>>>> 
>>>>>> ____________________________________________________
>>>>>> 
>>>>>>              Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
>>>>>> 15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
>>>>>>                   ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
>>>>>>                            mail to: sevcr...@westnet.com.au
>>>>>> 
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____________________________________________________

             Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
                  ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
                           mail to: sevcr...@westnet.com.au
____________________________________________________



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