It's a while, sorry!
Take a 16" pair of hemis, find which way they fit best (they are never truly spherical!) and cut off the top of one of them.
Drill and tube the fuse holes. and place the 3" shell inserts.
add tissue inside the 3" shell layer. Pour willow stars into the interstitial gaps between the hemi and the inserts. Then add an instant fused 6" shell in the centre and fill the space between tissue and the 6" inner petal with break on rice hulls (available from USA rice growers!). Then attach the upper ring of hemi and build up the tissue, inserts and willow stars to the top, then firmly fit the lid of the hemi.
After an initial pulling together and taping, the ball was passed to someone with a wasp and for the donation of lots of tape, it came back well wrapped and ready to fuse. The magnets were found and removed and the three pieces of time fuse fitted and crossmatched. 3lbs of coarse lift was in a bag and had a long QM leader and fixed to the bottom of the shell. Then I had to plait and affix the handle and the lowering rope so that it could be lowered gently into the tube. When it was all finally dried in the sun it went to the ready box for the dug-in mortar site and was dropped into the mortar in turn.
Additionally the mortar tube was so far in the ground that there were steps down to the muzzle! A muzzle break would probably have been retained!
- PyroPractic likes this