Suggested Mainshaft Tool?

[KTL]

Need to counterhold mainshaft on a 915 (not my 87 G50). I believe the Porsche tool # is P37A. But, nobody carries it, not even Porsche USA or Germany (not to mention it's a pricey one). What do you guys use to counterhold the shaft? An old clutch disc center with something welded to it? How about counterholding the drive axle flanges with some CV bolts on a diagonal and a length(s) of pipe. Trans. is on a stand, so I think that might work?

Any methods that are more practical/sensible than my simple mind can muster are welcome!

Thanks,

[ChrisBennet]

Kevin,
I think I know of the tool you're talking about but I've never used it. It's like a big "V" right?
To hold the shaft in place when it's still in the transmission I just put the transmission in 2 gears at once. (5th and and something else I think.)
When I need to hold it in place outside the transmission I use the aluminum jaws in my vise.
-Chris

[KTL]

Thanks Chris. I think it's the v-tool that's used. From what I understand, nobody must use this tool if it's not available. Engaging two gears at once makes the gears work against each other I assume? Good call. I don't know diddly about trans. wrenching. Just have a general idea how they operate.

[ChrisBennet]

I know slightly more than diddly about 915's but email me if you have questions.
-Chris

[Jim Sims]

Engaging two gear sets works well; the P37a tool really isn't needed. After the front cover is off, engage 5th and then reach up through the guide fork cover plate opening (guide forks and cover plate removed of course) and engage one of the other gear sets. For operations out of the transmission, put four long bolts through holes in an old clutch disk and secure the bolts with nuts; then secure clutch disk in a vise by clamping on bolts. Use the clutch disk splines to react torque on input shaft (or main shaft as you call it). Cheers, Jim