Use a stem extender?

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I see 2 types, 1 with a short bolt to preload the bearings.
stem-extender.jpg

And one with a long bolt.
61EsLOoltfL._AC_SL1000_.jpg

Any preference?
 
I think it would depend on how long your fork tube sticks up. It probably makes no real world difference here, but the shorter bolt would stretch less assuming the same material and size, so I would think it's intended that you would use that unless it wouldn't reach the fork tube.
 
Well I have another type. It was installed on my Felt Cafe when I got it.
IMG_20200505_204136.jpg

As you see it is the version with the long bolt. It bolts to the ahead nut as one would expect.
The difference is that it doesn't clamp to the shaft like an ahead stem (tightening the bolts making for a tighter diameter), but it has another element consisting of two identical metal pieces and a bolt. When they come closer to each other by tightening the bolt they press against the fork shaft and keep the extension in place. It also has a dedicated spacer - the spacer is conically rounded on the inside so it matches the curve on the stem extension.
 

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