Really big problem with stretchers ?

I use to be 16mm im now 8 as im getting older i just thought it would be more suitable LOL. I had no problems only if i stretched them to quick and when they happened depending on how bad or hurtful it was i would put the smaller one back in and let it heal completely and start again as its not putting any strain on it . Just be sure to clean it Thoroughly and try not to touch or catch it on anything so it can heal!!