perhaps we're dealing with more of a semantics issue vs. a procedural one. When I hear 'stretcher', I automatically think 'extender' but it's possible the 'stretcher' in question could be something akin to what they used in Medieval Times. (I didn't go thru the entire thread, so ignore if this isn't the case)
Just my $0.02, but my first tool was a Quick [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]Extender[/words] Pro and I hated wearing it, but there was NO WAY it could impart enough tension to actually cause damage, (I use more force pulling my d!ck out to urinate than what the [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extender[/words] imparted)