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Hi OneBob,
Had a quick look at your pics and it seems that I did pretty much the same.
I did'nt want to spend a fortune on a HL jack bracket and drew up a couple of designs all of which seemed quite fiddly.
I came across the bracket I am now using on ebay, 2 models... one alloy and one zinc coated steel, and as there is a reasonable weight tied up in the jack I decided to go for the steel unit... at a cost of about $45.
Once I received the mount I quickly realised that, even though the hole spacings of the bracket did suit the disco's bracket, it would not fit properly as when the disco wheel nuts were removed the logo cap in the centre of the spare wheel would not alloy the new bracket to sit flat. My initial thought was to make 3 beveled spacers to use between the wheel and new bracket then use the disco wheel nuts on the outside... but this was not suitable due to the bevel. One added problem was also trying to do all this while I was full time on the road (mainly outback!!). The answer to the problem was staring me in the face but it did not 'click' until a week or two later. I noticed that the disco's lock nut (when cover cap was removed to insert the lock tool) was drilled right through.. but not completely tapped right through. I suspected that the other 2 standard nuts would be the same. I knocked the covers off these and did find them to be the same. I subsequently drilled out the covers (clearance hole) and then ran an M14 bottom tap through all 3 nuts to completely thread them.
These could then be set back on the spare wheel bracket as normal and the new bracket then did fit flat against the modified disco nuts. I bought 3 new M14-30mm hi-tensile bolts that then bolted the new bracket to the carrier via the old disco nuts, also using a few wide washers as additional spacing... these washers would not have been needed it I had bought 25mm bolts instead of the 30mm. This method has not weakend the existing spare wheel mount and allows the new bracket to sit very close to the wheel eliminating excessive overhang and loading. I also put some larger diameter washers under the 6 bolts holding the wheel carrier to the vehicle to better spread the loading. As a further safety and security measure, I used a bike lock cable fed through the spare wheel spokes, bracket and HL jack just in case something was to fatigue and fail somewhere

... although if a failure occurred at the door mounting this would obviously not help much

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