If you can see the crab and where it is cut around the crabs cave - I use a icing spreader and a paint brush to work around the spot-- checking the underneath as you work
http://i13.photobucket.com/albums/a296/ ... nge018.jpg
http://i13.photobucket.com/albums/a296/ ... nge017.jpg
I spray the mound the whole time I am cutting to avoid collapse--now its ready to be filled with new substrate and molter is undisturbed. This one was easy I only had one down but I have had road maps at times

http://i13.photobucket.com/albums/a296/ ... nge019.jpg
I also shave off the top as much as possible being very careful.
I hope this helps someone approach deep cleans with more confidence
