If you want a decent Pz IV, then I'd advise you to buy Tamiya's suspension for it, whether your kit is from Trumpeter, Taigen, Heng Long...or even.. er..Tamiya
Put simply, it's precisely engineered, and fabricated out of good quality materials.
Look at these examples:
This is what a suspension bogey looks like after the spring has been secured by a 3mm grub screw, and some thread locker (Tamiya type). The next stage is to lift the assembly onto two road wheels, ensuring that the 'D' profiles of the stub axles
engage with the 'D' shapes in the rocker arms. The two cover plates are screwed in place to prevent unwanted dislocation under stress (and I know all about that
)
- Tamiya suspension basic layout
and here's the bogey ready for fitting ..
- Clean cut fittings..Tamiya Pz IV bogey
I really like the fact the the axles in the road wheels have two bearings per wheel, and that the shaft is locked to the bogey by matching flats machined on the spindles. The woeful Taigen kit has nothing like it...
and..no..Shaun, I'm not in receipt of a backhander, nor gratuity, nor greased palm, from Mr Tamiya San for making complimentary observations about his suspension systems! Don't forget how disappointed I was with the insubstantial, nay flimsy even, feel of the
KT Turret and upper hull
"Get your facts first, and then you can distort them as much as you please"- Mark Twain.
The packaging was incredibly neat too, almost equal to Apple's standards 
Perhaps we should have a star system for rewarding forum members for the best solution to problems, the Thread of the Month, or just for simple acts of kindness. Anyway, Many thanks, Mike...donor of the Month 
just listen to this wee rant (wait for the 20second ad to run and then press play..)
