Lining up TDC for valve adj

[MikeL250X]

I adjusted the valves today, but had a ***** of a time getting TDC lined up (on a 92 250X). off the compression stroke it rides to the T mark easily, but on the compression stroke, the piston wants to fall back down (yes the plug was out) I had to leave the ratchet on the flywheel bolt and lean it on the shifter to prevent the crank from moving.. any ideas on doing that easier?

[TRX_Thumper]

I always leave my plug in and it seems to do better. Just a little harder to turn tho.