Updates 12/08
The upgrade continues with the panther G with the arrival of the Mato 3:1 gearbox and a 1/16 scale metal bucket. I was excited to start installation of the gearbox as the stock plastic transmission was slipping and making grinding sounds due to the added weight of the metal tracks.
Needless to say it was the start of a lot of hours spent fixing the gearbox due to quality control issues that while annoying was in the end fixable. In fact, after I made the fixes, the gearbox runs as smooth as butter. However I would still call out Mato for selling a metal gearbox that needed a lot of tinkering to run smooth, when it should have been that way from the factory.
Anyway I started by installing the metal bucket to the pintle mount in the rear of the tank. I always liked the way panther's looked with the bucket attached to it like in the Bovington panther or from old panther pics like the one below.
And here's my version... granted my bucket needed a couple of dents.
After that I started with the gearbox installation. Right away I noticed the left drive shaft was severely bent. I spun the shaft a couple of times and the ends of the shaft (where the sprocket attaches) would wobble up and down at least 3 degrees from the horizontal. The brass shaft was pretty thick and would be impossible to straighten by hand. Hammering it was also out of the question as that will scuff and scratch the shaft and ultimately damage the shaft bearings as well.
I needed a straightening tool that I can precisely control. But first off I had to remove the shaft. I did this by loosening the 2 allen screws that hold the final gear and stopper.
Then pop off the metal stop that prevents the shaft from working loose from the mount.
And here is a pic of the shaft freed from the gearbox.
And now for the straightening tool. I scoured google to find a solution and ran across an RC Heli forum discussing the same thing.Turns out RC helicopters often bend their main propeller shafts and it can be costly replacing these all the time. EQMOD made a shaft straightening tool out of a pipe cutter.
Here is the forum link and EQMOD discussing his solution:
http://www.rcgroups.com/forums/showthread.php?t=913512
I made exactly the same thing (well there are some small differences due to available materials but the principle was the same)
I bought a pipe cutter from Ace hardware and removed the cutter and roller. Then I fashioned my shaft straightening tool like so:
The round nut attached at the top allowed me to direct the force at a very small spot in the shaft. The size of the pipe cutter is also important since the shaft is short and you wouldn't want the shaft ends to bend first. (see pic below)
I did this a couple of times and followed EQMOD's suggestion to make minor turns in the tightening wheel to prevent you from over bending the opposite way. I then rolled the shaft on table top glass to see if it was straight. Satisfied with my handiwork I re-attached the shaft back to its mount.
As it turns out, I also checked the right drive shaft to see if it was bent and lo and behold it was ,but not as severely as the left side. I again used the straightening tool and now both shafts are straighter than when they came out of the factory.
