Mod Kit : NES Frontloader Cartrdige Connector Fix v1.2
 
(July 2024 I've updated the install method for this, the old method made the connector a bit too grippy the new method is generally easier as well)
 
Fix for flawed frontloader cartridge connector.
This mod hardwires a standard toploader style connector.
This eliminates the terrible bendy pins design.
Never have cart connetion issues again.

Installation Steps:
 
Its easy to see the general idea with this mod, you're just hardwiring a new standard connector in place. The cartridge will sit further forward, so the tray won't need to be pushed down. 
 
1. Trim or cut off completely back plastic strip on cartridge tray. (see photo where I have trimmed part of the back plastic strip on the cartridge tray, you can use a rotary tool with any kind cutting disc, or just cut it completely off with a pair of snips)
 
2. Place front plate over nes motherboard edge connector.
Let the plate lean back then solder in place.
(leave approx 4mm gap from green solder mask on nes mobo)
(solder all four corners, visually check for solder bridges before continuing)
 
3. Solder the top pin header strip to frontplate
(important to do this before soldering on cartridge connnector!)
 
4. Solder on cartridge connector
 
5. Solder on black plate.
 
Screw on tray and you should be good to go with no more connector troubles!
 
Any question just ask, david@oldskoolconsoles.com
 
Customer Review:
 
The cart fix is super important as it makes the Nintendo consistently reliable. I would definitely promote it more. 
 
I've never had this level of consistency since the Nintendo was brand new and I've tried refurbishing old connectors and using new connectors. The only thing is that works 100% is your cart fix and the Blinking Light Win. 
 
I'd say your cart fix is better than the blinking light win as it's easier to get the carts out and feels more robust. You also don't have to cycle though the region codes, providing you've done the region free mod.