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I decided to make the Jacking System & The Cradle.
I like calling it cradle, because when I ship yachts from Europ, USA or Hong Kong to Singapore, I paid good money for a good cradle.
Something like below but mine is mixed with steel beams.
Make a poor cradle, the fiberglass hull can crack from improper pressure point locations and lack of load spreading.
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The cradle. This is not final yet, as it will have 3 more support points. 1 for DIFF and 2 for rear side of subframe under its bushings housing.
Now with exhaust system in the way, I can't complete the 3 more support points.
The two Y shape supports are to be for these 2 locations:
The wood Y shape will rest of the subframe steel and not the arm bushing/bolt.
Exhaust is still there and blocking my work for the 3 other support points
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These are the "height" measurements.
Height clearance for subframe if pulled out towards the rear.
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The 2 Jacks I use are for motorcycle, same like below : ( supposedly rated 500KG or 1,100 LBS )
I miscalculated the height of the jack base with wheels, by using 3inch caster wheel. It is too tall by 4cm, as per my calculation. I am using only a Quick Jack and not a 2 Post Lift, so my car rise up height is limited.
Anyway, I now have 2 version of the jack base with wheels for different task.
3 inch caster wheels
1 inch caster wheels. I use 8 pcs per jack, to spread the load. These are supposedly rated 30Kg per wheel. I tested 4 wheels and me at 69KG sitting on the jack playing on it like a kid
on a DIY skateboard , the wheel smoothness is not bad at all.