my sprue extenders

[Mic]

Guys,

I usually don't post pics because I have a hard time uploading them on here.  With your help I think I have figured it out.  Here are some pics of sprue extenders I made today.  I made 10 of them for a specific mold.  When the plastic cools it draws all of the plastic out of the sprue and causes voids in the middle of the bait.  I will be trying them tonight but here it is.....this is what I started with 5/8 X 3/4" coupling.  ...ground down the ridges, , nice tight fit in the mold and finally looking in the mold

[Mic]

my cost $1.53 each.  Not bad for a first try.

[hawgthumper]

Brilliant! Nicely done!

[Mic]

Just got finished with a little Green Pumpkin...100% perfect shots.  no worries after I topped them off.  It is a little tricky as the extender wants to stick to the injector, but a little more practice will work out all the kinks. 

[pieterbez]

That looks good Mic

[crappiezilla]

I was having the same problem. I just held pressure a few seconds longer. Cleared it right up.

[Denny Welch]

Good job, Mic.  Let me know if you ever decide to market them.

[ipt]

not to rain on your parade... those look great but you can already buy pretty much those exact things from copper fittings for cents.

[Denny Welch]

Yeah, you can, but, Mic's look so much better.

[MO QWACK]

Awesome, genius

[kipbass]

Mic, may I ask what mold was giving you fits? If I ever run into the same problem, I'll know what to do.

[Mic]

Denny, wont market them, but I will send you a couple if you need them.   

IPT, I was having trouble finding the copper fitting so I improvised, adapted, over came.  Mine get real hot...and I figure the copper will be worse. 

I am not going to say which mold that was giving me fits...Lets just say any mold with a short sprue will have this issue. 

[ipt]

your look better for sure, and yes the copper gets very hot, but its usually handle-able by the time the plastic cools. i really only use them for hand pouring, they will fit injector tips but like you said they stick to the injector. what solution do you have for them not sticking?