Reddit reviews Copper Glue Gun Nozzle Assortment Set Interchangeable with Spanner Kit for Replacement, Nozzle Diameter 1.5, 2.0, 3.0mm Length 70mm Thread Diameter 10.6mm 4pcs/Set
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This nozzle can help to glue in narrow spaces, 3 different nozzle diameters meet different job requirements.Come with small wrench, fit the nozzle size, easy for the replacement job.Size of Nozzle: 1.5*70mm, 2.0*70mm, 3.0*70mm, thread diameter: 11mm.Whole body Made by copper material, Excellence thermal conductivity make glue flow more smoothly and faster.
Unfortunately I doubt hot glue will work much smaller than this. If 1.5mm is too large you probably need a different type of adhesive.
https://www.amazon.com/Assortment-Interchangeable-Spanner-Replacement-Diameter/dp/B07421F6J8/ref=pd_aw_fbt_469_img_3/138-6664811-5881146?_encoding=UTF8&pd_rd_i=B07421F6J8&pd_rd_r=32adda7d-5cf8-11e9-8fab-7392133f7554&pd_rd_w=RKnv4&pd_rd_wg=LZtQz&pf_rd_p=3ecc74bd-d08f-44bd-96f3-d0c2b89f563a&pf_rd_r=EX655WSH7GQYH6DFS378&psc=1&refRID=EX655WSH7GQYH6DFS378