Not sure how many of you are into CA (Krazy Glue) applications but I stumbled onto these tips & I really like them. You stick them over your regular bottle tip but the glue travels down the the skinny pipe in a much more controlled ®ulated manner. I've used them on thin, med, thick CA so would probably work for other applications. Maybe not viscous oil. Unfortunately there is no standards when it comes to bottle stems, but thus far they have fit the ones I use. The plastic is a little bit rigid, I would have preferred it more supple (on the wider base) to conform, but they basically press on. maybe bit of heat might help but haven't tried. I've seen them on Amazon & Ebay too, but check prices.