[Roache], Boston's former police commissioner, Tuesday won the Democratic primary for the low-profile county job. He faces no opposition in the November election. Roache said yesterday he would resign his council seat as soon as he is sworn into his new post.

Roache last year lobbied Secretary of State William F. Galvin for an appointment to the post, which Galvin refused, saying acting Register James C. Doyle Jr., who served as [Register Paul R. Tierney]'s deputy, was doing a good job.

Yesterday, both Roache and [Felix Arroyo] said they would urge Galvin to reconsider appointing Roache so that both he and Arroyo could get started on their new jobs.