I'm the SM of a small troop, and have been through this recently. A year ago when I moved from COR to SM, the troop was decidedly not boy-led, and it has been a slow process getting on track. We currently have 6 active boys; 1 Life, 3 Tenderfoot, and 2 Scouts.
A few months back, we reduced the term of office to two months, and only the PL is elected, no SPL and one patrol only. When the PL is elected, he appoints each of the other boys to an office, and each office has an adult advisor. Two months is a pretty short rotation and some of the appointed positions (scribe, quartermaster, historian, assistant patrol leader) don't get much done during their term, but I don't feel that's the point at their level. As the PL's advisor, I give as much guidance and pressure as he can handle, and as much control as possible. The PL plans and leads the weekly meetings and teams with the Troop Instructor for the campouts. It's working for the time being, but I look at it as a temporary situation until the troop grows into a larger command structure.
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Russell