When rolling paint onto narrow spaces and small objects, it’s best to use a 3-inch paint roller. The problem is that 3-inch roller sleeves cost about $2 apiece.
However, you can make your own by simply buying standard 9-inch roller sleeves and cutting them to 3 inches long using a hacksaw. (Trim any rough edges of the nap with scissors.)
A 4-pack of 9-inch roller sleeves cost about $8.35, and each sleeve renders three 3-inch sleeves, costing just 70 cents each!