OCCT

restore [locate_data_file bug29481_ex2.brep] s
explode s f

# remove the gap 
compound s_7 s_8 s_9 s_10 gap
removefeatures res1 s gap
checkshape res1
checkprops res1 -s 624 -v 992
checknbshapes res1 -vertex 16 -edge 24 -wire 12 -face 12 -shell 2 -solid 1
CheckIsFeatureRemoved gap {v e f}


# remove hole
explode s
removefeatures res2 s s_2
checkshape res2
checkprops res2 -s 608 -v 992
checknbshapes res2 -vertex 16 -edge 24 -wire 10 -face 10 -shell 1 -solid 1
CheckIsFeatureRemoved s_2 {v e f}


# remove both gap and hole
removefeatures result s gap s_2
checkshape result
checkprops result -s 600 -v 1000
checknbshapes result -vertex 8 -edge 12 -wire 6 -face 6 -shell 1 -solid 1
CheckIsFeatureRemoved gap {v e f}
CheckIsFeatureRemoved s_2 {v e f}