Easier to do on a fs reel with spare spools..
Wind your desired amount of braid onto a spare spool first then wind on the
backing (not forgetting to join the two of course) to the correct depth,
then wind the lot back onto another spool.
Backing is then covered by however much braid you selected.
A bot of a pain doing this with multis unless you have a pair..
Tight lines
Keith M

"Fantom" wrote in message
...
Hi, how much do you roughly add of mono backing to the reel prior to
braiding?

TIA