probably too much tension on the spokes.
do not attempt to adjust the rim by applying too much tension on spokes.
deformed rims cannot be adjusted by this.
it is very important that tension is equal for each spoke. they have to sound equal when striking them with a wrench.
connect the spokes where they cross each other with a piece of wire or plastic cable straps. if one breaks, it cannot destroy something else.
good luck,
klaus
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