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MG TD TF 1500 - Windscreen shield MG TF

Dear Friends,

I repair my MG TF windscreen frame. There are 2 types of screw. The one is Pozi countersunk screw, the other is slotted countersunk screw. What is the orignal places of the screws? Can you send me a picture, when they were in the original position? Thnaks you,
Tamas
PT Panker

Photo to my question

PT Panker

Tamas, my TF has the Philips (Pozi?) head screws on the top but I can't see the side as the windscreen side post covers it so it doesn't show.
Don TF 4887 TC 1736 SA 1018
Don Walker

Tamas, I think originally Phillips head were uses where they were visible and slotted used where they could not be seen. "From the Frame Up" sells these chromed 2BA machine screws for the windscreen with all slotted heads. I think the "Posi" headed screws you show in your picture look much too modern and the use of all slotted would be better. The "Posi" head is not the same as Phillips altho' they look similar and would use the same screw driver.
Hugh
H.D. Pite

Yes, the Posidrive screws are too modern and have that additional thin cross between the thick Phillips head cross. The screwdrivers are actually slightly different - the Posidrive type has additional truncated ribs / flitches / strakes between the cross of the Phillips type, this gives additional grip. The wrong screwdriver works but is less effective and can damage the screw if used at high torque ( but then using the wrong sized screwdriver seems commonplace, resulting in similar damage).
Dave H
Dave Hill

Tamas,

My windscreen appears to be the original.

The phillips screws are top mounted.

I do not believe this glass has ever been removed.

See attached photos.

Dan
TF7946

Dan Nordstroom

And the screws

Dan Nordstroom

The original Phillips head screwdriver tapers slightly towards the tip so there is a slight resultant force pushing the blade out of the socket in the screw. The Pozi-drive blades (and sockets sides) are parallel so there is less need for axial force as virtually all the applied torque is transferred to the screw. While the two are, to a certain extent, interchangeable there will come a time when the heads on screws that are frequently used (eg dashpots on Strombergs) are damaged.
For similar reasons the blade of a slotted screwdriver should be ground as near as possible parallel - most aren't from new!
Sorry, retired shop teachers often can't help themselves.
Chris
C I Twidle

Dan, those look completely original to me.
IYou've obviously looked into it more than I have Chris. Presumably the Pozi-drive came about as a result of the use of powered screwdrivers.
Dave H
Dave Hill

I have grumbled about suppliers not making correct replacement Phillips screws for years to no avail. Since I have no clue how to make or have them made, will have to use the posidrives or find originals and have rechromed. Most important thing is not to use screws too long as they will extend into and break the glass! George
George Butz

" have grumbled about suppliers not making correct replacement Phillips screws for years to no avail. Since I have no clue how to make or have them made, will have to use the posidrives"

George:

I have a TE. The screws were slotted.
I found that Modern Screws have a somewhat different head. A bit smaller in diameter.

I used SS 10-32 screws which are very very close to the 2BA.
I turned the heads down on a lathe.

(See Pix)

Note the little holding fixture. Its a piece of hex stock, threaded 10-32 and slit. This can be held in a 3 Jaw chuck just as well.
I also use that, or one like it wit controlled length, to cut the screws to the correct length.

Show that in next post.

A quick buff on a wheel and the SS will polish up just like chrome and never rust.

Jim B.


JA Benjamin

Showing screw cut to length

Jim B.

JA Benjamin

Dan and Hugh are correct. Old fashioned Phillips heads where visible and slotted where covered by the uprights.
Christopher Couper

This thread was discussed between 06/08/2017 and 11/08/2017

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