I have a bycicle tire intertube over waxed line on my 18-5 1/2 Model 18. It works well.

Truthfully though, I wish I had a 7 1/2 inch blade on this knife. The "stubby" 18 just doesn't suit me.
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David
RKCC No. 654
RKS No. 5462
SHAG No. 003
NRA Life Member
www.explorerconsulting.com