Safety flag for HW100

Hello --
Been a while since last posted here.

Just in case I take it to the club, I need a safety flag for a Weihrauch HW-100 .22, with the shorter sporter length barrel. Been using trimmer line in other guns, but this short breech opening is kinda tight. I don't like threading from the muzzle end.

Any suggestions from maybe the FT folks or anyone that uses such flags in an HW-100?

My kid aged into 4-H Air Rifle, and Dad got wrangled into L1 instructor classes. So keeping things on the up and up...

Mark
 
idea for breech block
 
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