I use a blow dryer to shrink the capsules and get mixed results. Most of the time the capsules look really good, but on occasion they are distorted. Especially irritating is one bright red capsule where I can't get it to shrink evenly. That wouldn't be bad except I purchased a lot of 500 ...
Next batch I'm trying the boiling water. If it works well, I'll purchase that tool for holding the bottles.
Why use capsules? I apply capsules to keep the cork and the top of the bottle clean. My "cellar" is very clean, but bottles setting for a year+ develop dust and stuff. I'm in central NC, so spiders are a foundation of existence -- webs on the bottles irritates me and require washing the top of the bottle before opening.
Plus the presentation is much nicer.
Side note -- I'm not fond of spiders (insects don't bother me) and I only like 1 species of spider -- the flat ones. Those are ok. Sometimes messy, but ok.