I just fitted a coil sleeve to my JD shooter as it was missing. What a difference the ball now fires into play like a rocket! Unfortunatley it also centre drains most if the time- some alignment may be needed.

I just measured the coils dimensions with vernias to get the right one. Coil sleeves are good!

Z

Yep shooter sleeves are missed many times.  If a games shopped properly,  and I mean all parts,  all sleeves must be done too.