You are talking about the circular easychange plate style guides they've been using for about 5 years? I despise these horrible little over-engineered shallow things and the reason why Scalex made them with braids too far apart for the track rails and with delicate wire connections.
I've read that SlotIt guides with long guideposts fit, but they do not.
The guidepost is the wrong diameter for replacement with every manufacturer's guides I've tried (Ninco NSR SlotIt Fly MBSlot) who do deeper guides. The only way to fit the ones with long post shafts is to either trim the shaft or drill out the guidepost hole. Either way the engineering weakens and in all cases the braid surface is too far away from the track so you don't get any deeper contact.
I actually dont think its that bad a design. Scaly make a deep 7mm guide replacement, part no C8420. Get rid of the doubling up of the braid and use a better quality soft braid. I use the std guide for all my non mag club racing and it seems to be ok.
Tifosi is right the Scaly C8420 "Rally Guide" is their best kept secret and a better solution for wood tracks than the standard arrangement it will however leave you with the same ride hieght forn the front of the car.
The ultimate solution is the B-nova scaly guide adapter 1/32 thickness (GM-02) and a Sloting Plus Screw fix guide (SLPL2131 or SLPL2130).
The B-Nova adapter is the invention of a man from across the pond by the name of Bob Novack, the adaptor is basically a sleeve that fits into the scaly guide post and also provides a platform for guides with a thinner back plate such as the 2131. Once fitted you will also be able to reduce the front tyre diameter and lower the front end for a better handling car.
The link below will take you to a host of imformation on where and how to get hold of them and more about what they look like and do.
It's a permanent fix but it's easy to extend the depth of the Scalextric guide to suit a wood track.
Cut a strip of thin clear plastic from blister packaging or similar about 7/7.5mm deep and as long as twice the guide length of a Slot.It deep wood guide with a couple of extra mm added on for good measure (obviously if I wasn't at work and had one to hand, you'd have a real measurement there. From memory maybe 50-55mm or so).
Fold in half and cross-hatch score the inside. Cross-hatch score the Scalextric guide. Superglue the sides of the guide and fold the plastic around it with the inside of the fold at the tip of the guide, grip tight with pliers until the glues dry. Sprinkle some baking soda on it to accelerate the superglue if needed.
Don't glue the "tail" of the plastic where it overhangs the guide, it works better if allowed to flex slightly and conform to the slot in tight corners.
Quickest, easiest, cheepest solution I've found is to put the back half of the blade in a vice and tighten. Retains the thickness at the front of the blade, but gives extra depth at the back with a smooth transition between the two. My initial experiments were to get extra depth for the old C7030 PB sensors. This approach enabled me to control the amount I increased the depth by the tightness created in the vice.
Another option is the Ninco prorace N80111 guide. This is the one without the spring.
I tried the sprung one N80112 but it sits too high. The N80111 has a moulded in collar at the base of the stem.
I have only used these on the Camaro Glades version and the ride height of the guide is determined by the front wheel/tire diameter.
I am using the slotit 15" shorthub rims on the front and the 16.5mm shorthub rims on the rear.
The actual guide holder stem that protrudes from the chassis on the Camaro doesnt look very strong or allow a lot of swivel but it does work on my car on a flowing wood track.
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