Quoted from chuckwurt:
1. The bricking issue. This is when a hard straight on shot to the target doesn't drop. like hitting a brick wall.
2. Upon reset, one or more drop targets fall down.
I know there are various threads on these topics, but it seems there is no sure fire way to eliminate these two issues for good.
My current issue is Flight 2000. The spinner drop targets on the right are dropping upon reset what I have tried:
1. tighter springs
2. shaving a couple MMs of the drop target off to increase the lip that rests on the target housing when up.
3. putting a tighter rubber behind the targets to make sure there is nothing impeding the targets from their up travel on reset.
(1) The bricking issue: I agree with what Vid said. Wax the lands on the target and wax the metal strap the target rests on and they will "drop like stones". Could the tighter springs you are using be part of the reason they are bricking? How do the targets act when you push them with your finger? Do they drop or seem to hang up? I don't have any of this bricking issue with any of my Sterns so I am just guessing. I don't think using a tighter rubber behind the drops would help with your issue because, IMO, the target land would be pushed clear of the strap and drop when the ball pushes the target backwards.
(2) on targets falling down, I have this issue with one of the drop targets on Seawitch not staying up some of the time. I have not messed with it yet but my thought is that the land on the target has possibly worn a little bit.
With your targets in the up position look at the opening in the play field and make sure the targets are not contacting the play field which could keep them from resetting properly. If the drop assembly is located too far forward, the targets could be riding against the opening which could affect the resetting. If they are contacting the opening in the play field you will need to relocate the drop assembly a little farther back. I would not be surprised if this is part of your problem. I'm not saying you will find drop assembly mis-located but as I continue to learn more about my Sterns, I see that parts location accuracy was not one of Stern's strong points, so don't rule this out.
I'm not sure what you are saying when you say you are using tighter springs. Do you mean you have installed new springs? Stern's Wild Fyre used longer springs but by the time Big Game came around Stern was using a shorter spring and a different way to mount the shorter springs. Steve at PBR sells both long and short springs. If you installed a spring shorter than what he sells then I could see that as part of your bricking issue.