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Post by kevinbrixhamdivvy on Sept 22, 2014 13:02:28 GMT
Has anyone found an easy way to overcome rounded off screws securing the lid to the master cylinder?
How did you get them out?
Where can I get Allen key head replacements?
Thanks
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Post by HRHpenfold on Sept 22, 2014 17:29:28 GMT
Has anyone found an easy way to overcome rounded off screws securing the lid to the master cylinder? How did you get them out? Where can I get Allen key head replacements? Thanks They have always come out for me, I just use a good fitting cross head screwdriver, and tap the head rapidly with a half pound hammer, as I turn the screwdriver, Otherwise it's drill the head out and remove the remains with mole grips, I just buy a bag on eBay, Not sure of the size at the moment, possibly M4 Like thisThough you will have to confirm that, I prefer slotted screws though! |
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Post by sledgegreen on Sept 22, 2014 19:38:13 GMT
This sounds counter intuitive, but I use an impact driver on mine.
Choose a bit which fits the screw well (if the screw head is already mangled, choose a bit which would fit well if the screw were in good condition). Put it in the screw, apply hand pressure to push it firmly into the screw, then turn slightly anticlockwise - at this point you are only trying to take up the slack, so when the impact driver start to ride up the cam, stop.
Now give it a good whack with a hammer.
Hitting it with the hammer pushes the screwdriver into the screw before turning it, and that prevents it riding out of the screw thread.
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Post by bobh on Sept 22, 2014 22:34:00 GMT
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Post by sledgegreen on Sept 23, 2014 1:31:59 GMT
Since my previous post I thought that it might be helpful if I explained how an impact driver works, so ...
an impact driver (at least my impact driver) is a steel cylinder about 2inches (5cm) in diameter and 6" (15cm) long. At one end is a 1/2" drive so that you can fit sockets for loosening tight bolts. Normally, mine is fitted with a conical bit holder. The bits are like the screwdriver bits you get in many socket sets, but thicker.
Inside the metal cylinder is a strong spring and a ratchet mechanism. Whacking the cylinder with a hammer compresses the spring and pushes the bit really hard into the screw head, and then the ratchet engages and gives the bit a sudden small twist. Because the spring is still pushing the bit into the head there is very little chance of the bit riding out of the head, and a good chance that the screw will turn just enough to break it free.
A couple of tips - when the bit holder turns in one direction, the handle part tends to turn in the other direction. It is well worth making sure that there is no slack in the system before applying the hammer as I described above. The better you can prevent the cylinder part turning, the greater the turn put into the screw. Secondly, beware of the slight gap between handle and bit holder. This disappears suddenly when whacked, and if the little finger of the hand holding the driver is lying over that gap, it will get bitten.
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Post by kevinbrixhamdivvy on Sept 25, 2014 18:14:38 GMT
I have now removed both screws. 1 came out with the impact driver, 1 needed a punch. New screws ordered eBay. Thanks for all the advice.
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