No I broke mine taking the head off the first time I blew the pistons Oh and if you end up pulling the input shaft do not use them jack screw ears as they break off also. I found a wood drift on the shaft works better. Who knows maybe Nev will come by with a subtle trick for it since he can probably do it in his sleep. Just saying because I am still gambling that you fifth gear input popped a circlip and slid on the shaft. Of course I have seen a few fourth gears (ouput shaft) break up.
There is a company Robinson Industries that produced some heavier duty forth gear.