No - SHS 13:1 will suffice
Where are you going to get:
fine ranges of shims 0.1, 0.15, 0.20, 0.25 etc.....
yes I know 0.1 + 0.15 = 0.25, but also sometimes a wide outer diameter will suffice - eg under spur gear
but other times a smaller outer diameter shim of same thickness might be preferable - eg bearing
So where will a good range of 4mm shims come from - yes they supply some but betcha want one in between
The G&G DSG HC05 had a mix of 3mm & 2 x 5mm axles on spur & sector
wot a PITA trying to reshim due to no thinner 5mm shims about
Plus they used 9mm not 8mm holes - got some SHS 9mm bearings with 3mm axle or ID's
As well as sourced some 9mm 5KU 9mm bushings - but what a pain tbh
(so yeah sod these unique/bespoke/odd ideas I feel)
4mm bushings/bearings to fit into gearbox - yes they might supply but options of solid/cross/bearing etc.. will be limited
As pointed out - bearings on shaft inside gears - hmmm mixed reviews & I'd be worried more about spur gear in middle
Also - have you broken a SHS 3mm axle yet ???
G&P might have had weak axles but not SHS - OK some clones or bad batches existed
but usually I'd say the bevel's 10 teeth would strip off first if you had a mash up under stress
(must have a spare compatible 3mm bevel in ya box - where would get a 4mm axle bevel from ??)
A 3mm bevel - just pick one that looks decent and meshes ok with pinion & spur
So yeah 4mm axle stuff - hmm maybe not tbh
Like them sector gears that have a bearing to draw the tappet plate back...
Sounds good having a rolling bearing to reduce wear of tappet fin
But if you want to add a delayer - you can't
Think I'd stick with ol' school stuff, seems to work OK, easy range of bits - shims, bearing/bushings etc....
Until the ar$e falls out I'm happy to stick to decent 3mm axle gears I think
make sure you use a bushing under spur gear - see this clip
what you do after that is up to you
I personally do bushings under all 3 gears then add bearings on top of spur
The other two I place what ever works ok, if I have a bearing that I feel is robust I will use it on bevel
(give it a bit of free running maybe)
The sector - well not bothered tbh as it turns the least out of the 3 gears
the bevel will turn 6.25 times on 18:1 gears or 4.25 times on 12:1 to 1 rotation of sector gear
(so no real biggie what goes on top of sector really imho - if it rolls nice then a bushing or bearing maybe)
