Digital BW, The Print

The Murphy's law came abbout. One of the replacement plugs for my MIS
spongeless 2400 carts bounced down the drain. 
Anyone have experience with using an alternative? 
I have never seen the plugs available from MIS

http://www.inksupply.com/cart.cfm?action=add&itemid=SLC-PLUG-outofstock

I have seensearch postings of cometitive cartridge plugs and screws
with "o" rings, but I'm a girl. You boys are supposed to tell me what
might be a workable substitute.
So ..... ?