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For a nub in the PDI chamber, people have reported success by using a pen ink tube. Like, the plastic tube inside of pens (any old pen like a bic pen will do) that holds the ink. Some complain that the ink tube is too hard, but I think that stiffness means consistency, while flexibility is opposite. I even managed to use an old Lego flagpole piece and cut it to fit.
What you could also do is use an SCS or PCS or H nub (which would be pointless if your bucking has a concave nub or anything like that inside like a PDI W-nub bucking, but useful if you have a flat nub or no nub). Simply use some non-drying modeling clay to "stick" the nub to the hop up arms. You can easily find some of the clay at a Walmart or Target in the arts & crafts section. When you stick the nub on though, you'll have try and make it as centered on the arms as much as possible.
What you could also do is use an SCS or PCS or H nub (which would be pointless if your bucking has a concave nub or anything like that inside like a PDI W-nub bucking, but useful if you have a flat nub or no nub). Simply use some non-drying modeling clay to "stick" the nub to the hop up arms. You can easily find some of the clay at a Walmart or Target in the arts & crafts section. When you stick the nub on though, you'll have try and make it as centered on the arms as much as possible.