I bought the Micro Plane TSV about 12? years ago and it's still going strong and does the trick in one session to get my feet sandal-ready. One of my top QVC purchases and no refils replacements required.
https://www.amazon.co.uk/dp/B00RPOX4H0/?tag=shoppingcom03-21 and http://www.ebay.ca/itm/Microplane-O...678772?hash=item2a5f6e1eb4:g:RUoAAOSwJkJWlU3Y the TSV had both in a set for far less than the Dabbs foot file.