What is the best recommended way to mount the unmounted stamps?
There are many ways of mounting unmounted rubbers, all depending on how much storage space you have. I personally like using a double-sided (sticky) foam and mount it on small square/rectangular wood blocks or tiles as doing that allows me to label a sticker picture on top for reference of designs (please remember that this is PERMANENTLY mounted). Some like to put a strip of velcro behind the rubber and store that in a file folder. They then have a woodblock with the other side of the velcro strip which is then used for mounting the rubbers on when in use. This way saves storage space as the rubber can be attached for use and detached for storage; the woodblock generally can be then used for several rubber of approximately the same size. So, you would have a woodblock for all your A-sizes, another for B-sizes, etc.
