16 years ago
This is a drawing of a European trailer hitch by Westfalia Automotive
in Germany. It's used on some Audi models. Unfortunately, it's not
sold in the US, so it only comes with a 50mm ball, part of the
cast/forged removable portaion. =20
The 50mm ball will be a close fit in a US 2" coupler, but there will
be some slop, and probably increased wear.
One option I considered is to have the 50mm ball plated to increase
it's diameter to 50mm, or even do it with a tough paint..=20
The machining alternative is to cut the ball down to a post to fit the
balls from Convert-A-Ball hitches:
I doubt it's possible to do this in a lathe, since it would be
severely unbalanced even if you could fixture it. =20
The way I see it being done is to mount it on a mill and use a boring
head to cut it down. Is this possible? (I don't have a mill yet)
BTW: The way this hitch works is that you pull the knob on the side
and twist. It retracts the pins into the cone-shaped section and
latches in this position.
When you insert it into the receiver and push up, a lever trips the
spring-loaded mechanism, which forces the pins out into holes in the
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