|
I have used aluminium flashing material ( from Bunnings) to fill the gap. I had some in the shed and it was the perfect thickness and can of course be bent in a perfect circle. You don't want it falling into a scope so securing it needs to be considered. I found some thin pvc tape worked well to secure the flashing, cut to notch width so it doesn't overlap the barrel, it worked fine for a short term fix.
I have also considered using heat shrink tubing of the right diametre, just cut a short section to match the notch width and heat it in situ, it would fill the gap, or you might need two layers. Heat shrink is easily removed and does not leave a sticky residue.
|