100W Attenuator Base

I picked up this 100W 30dB attenuator on eBay. It was so heavy I thought I reallyneeded a base for it to keep it from rolling off the bench.The attenuator itself is 60mm in diameter and 97 long (fin to fin).It uses US standard ½" ft, so 12mm rubber feet should work fine as well..The link to the attenuator: https://www.ebay.com/itm/132392553222