[C320-list] Mast thickness
KEN GEIGER
kendgb at aol.com
Wed May 17 10:20:17 PDT 2023
On the Aluminum parts on Alfa Romeo engines and other units, the studs are coarse metric in the aluminum and fine thread for the attaching nut. So I suggest the coarse thread be used when possible.
Ken Geiger#765 Northern Dream
Sent from AOL on Android
On Wed, May 17, 2023 at 12:36 p.m., surprise thompson87.com via C320-list<c320-list at lists.catalina320.com> wrote: The one that stripped was 8-32 so 10-32 would work. But I was also wondering if the coarser 10-24 would be less likely to strip in the future.
> On May 17, 2023, at 9:50 AM, P.F. Ross via C320-list <c320-list at lists.catalina320.com> wrote:
>
> Scott,
>
> Was able to measure my replacement mast gate screws today. I used 10-32 SS
> button head cap screws.
>
> I used a lubricated #21 tap drill (.159) but a 5/32 (.156) would also
> work. When tapping in spars, I like to chuck the tap in a variable speed
> drill and proceed slowly at low rpm, much easier to keep tap square rather
> than using a handle. I also use "Tap Magic" Aluminum cutting fluid while
> tapping.
>
> And as others have noted, I use "Tef Gel" on the threads when installing
> screws to help prevent corrosion. Did this 25 years ago and all is well.
> I am able to snug screws down tightly and have not come close to stripping
> them.
>
> I also posted a pic of the smooth button head profile on the gate in my
> owners gallery album online.
>
> Regards,
>
> Frank Ross
> Beta Wave #206
>
>> On Sun, May 14, 2023 at 6:33 AM Bill & Kay- Diversion via C320-list <
>> c320-list at lists.catalina320.com> wrote:
>>
>> Tefgel to prevent SS-aluminum corrosion. Lifetime supply on Amazon for $36:
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>> -----Original Message-----
>> From: Greg Flanagan via C320-list <c320-list at lists.catalina320.com>
>> To: C320-List at catalina320.com
>> Cc: Greg Flanagan <greg.flanagan at shaw.ca>
>> Sent: Sat, May 13, 2023 7:26 pm
>> Subject: Re: [C320-list] Mast thickness
>>
>> Yes, thank you.
>>
>> PS the machine bolts I used on the plate were machine head (round) not
>> knurled, so they need a screw driver. We use Roberts heads here in Canada
>> as they don’t strip out like slot or Phillips. However, a hex head would
>> also be good. I don’t take the plate off. I just loosen it and it gives an
>> opening where the glides can slip in.
>>
>> Greg
>> Hoop Dancer #1076
>> Sidney, BC
>>
>>> On May 13, 2023, at 4:10 PM, Dave Hupe via C320-list <
>> c320-list at lists.catalina320.com> wrote:
>>>
>>> Greg-
>>> Probably Lanocote grease for use between different metals?
>>> Dave Hupe 1994 C320 #32
>>>
>>> Sent from Yahoo Mail on Android
>>>
>>> On Sat, May 13, 2023 at 6:56 PM, Greg Flanagan via C320-list<
>> c320-list at lists.catalina320.com> wrote: I had the same problem. I got a
>> drill bit and tap the next size up. Redrill the hole which will not
>> generate much metal as the next size is about the size of the old tap. The
>> thickness is only about 3/8” so one needs to tap carefully maintaining a
>> strict perpendicular approach. Aluminum is easy to tap but still use oil
>> while doing this. I went with a fine thread. The cause of the initial
>> problem is a SS machine bolt going into aluminum. The dissimilar metals
>> rots the metal. A friend gave a grease like material (help needed on what
>> this is) to coat the new bolts with before I reassembled the plate. It is
>> now over 10 years and all is well (even better).
>>>
>>>
>>> Greg
>>> Hoop Dancer #1076
>>> Sidney, BC
>>>
>>>
>>
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