Take it down and sand down the areas that are making contact. I’d use a small orbital sander like this one.
BLACK+DECKER Random Orbit Sander, 5-Inch (BDERO100) https://www.amazon.com/dp/B00MLSS1SW/ref=cm_sw_r_cp_api_glt_fabc_VJ8BC2861W3KVRVHM7YD
Muglug is right on every note. I'll just mention that I got my ROS here BLACK+DECKER BDERO100 Random Orbit Sander, 5-Inch https://www.amazon.com/dp/B00MLSS1SW/ref=cm_sw_r_cp_apa_i_nzyxCbMB3536X
Its not professional quality, but the price is right and, since you're just needing something for a DIY project, it will be fine for your purposes. You can also save a couple extra bucks by getting it through Amazon Warehouse Deals. In the frequently bought together, there's a 60 piece variety pack of sanding pads. It's more than you need, but you will probably pay about the same or more to buy individual packs of the different grits.
Thank you for your responses. You've been very helpful
I have been using this....
https://www.amazon.com/gp/product/B00MLSS1SW/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
Works well, holes line up with all sanding disks I have bought. Doesn't get hot, fits well in my hand. Dust collection is actually pretty good( I don't use a vacuum set up on mine, I'm not sure a standard ShopVac port will line up.)
Deal link: Amazon
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