SuperLube

You can make sure everything is straight and you can polish points of contact. Tiny amount of a light lube. Make sure your switch connected to the spinner isn't causing too much drag. Adjust if needed.

I put a small weight on the actuator rod and waxed the spinner shaft with carnuba (used a q-Tip.)

Good suggestions so far, only other thing i can recommend is to make sure the spinner sits perpendicular to the playfield when at rest. If it's leaning forward or backward, it may work less than optimally. Also make sure the spinner switch is gapped properly. If there's a lot of tension coming from the switch as the spinner turns, that can also cause less spins. You may need to adjust one or both switch leaves to get it just right.

Good luck!

I 2nd the Superlube. I put it on the spinner on my Alien Poker and holy crap, it went from like 12 spins on a plunge to like 40. It's amazing stuff!

Polish, align, switch tension, switch gap, lube... all good ideas above. Use those tips and you’ll get spinner rips like this.

i use this on all my spinners. it works awesome. such a difference. and when it flakes off or drips, its wax so i would think it would be better than oil on the playfield and plastics.

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Man I love ripping the spinners on classic Sterns.

1) Make sure the spinner is perpendicular to the playfield. Usually all that is needed to fix one that isn't resting properly is to push on the back of the spinner (opposite to the side the ball hits it) and carefully bend back the wires that are suspending the spinner. The wire gets bent back by the ball hitting it on the front.

2) Spin the spinner by hand and carefully watch the wires that suspend the spinner in it's bracket. Watch for wobbling. Carefully bend the end of the wire so that when you spin the spinner, the wire does not wobble. Repeat on the other side.

3) Make sure the wire is not rubbing on the mounting bracket on either side. Make sure the little plastic washers are installed to stop rubbing and keep the activation rod in place.

4) Make sure the spinner is not hitting the top of the mounting bracket as it spins (these can get bent when shopping/cleaning). Make sure the wire is not hitting any plastics or screws.

5) Make sure that only the lightest action is needed to activate the switch. You don't want the spinner to have to bend the switch blade unnecessarily.

6) Very small drop of lube on each pivot point. Do not lube the activation wire leading to the switch. On modern games with micro-switches, I wipe a small amount of lube on the switch blade as there is rubbing there. DO NOT get any oil in the switch.

Super Lube or Silicone spray on a Q Tip works well.