Yes the rocks problem was the fuse so i fused the sling coils damn stuck switch.    Funnilly we sold the fuse holders at work obviously been there for years as they are $1.95 each which i think has to be cheap so im gunna grab all of them

The small mountable (single) ones are very hard to find.

Good for you to keep some spare for your personal Sys80...I reckon a HH, or BH for yourself?