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Older DA-150 throttle question !

js-rc

70cc twin V2
I just got my first big DA-150 & while trying to make linkage to the servo I'm wondring why there is such a giant hole on the arm ? There's a smaller hole there too but a ball ink would hit the choke ball link. Is there a some special bolt washer missing or do they make another arm for these ?
Appreciate any help !!
Thanks, John
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