I have a 2009 G37 coupe and I need to replace the oil pump. I've got everything pulled apart up to the timing chain. I either need an affordable ring gear stopper to hold the crankshaft in place, the dimensions and maybe a picture of a gear ring stopper so I can attempt to fabricate one myself, or I'd love to hear any suggestions on other ways to hold the crankshaft in place while removing/replacing the oil pump.

Any help would be greatly appreciated!

Thanks