I bundle up some string under the shaft to hold it up high enough. Once it starts to thread the splines I pull out the string.
I've tried warp's method and never had any luck... guess I wasn't holding my mouth right. Might try it again on the next one which is coming up between now and May the 17th...lol
Every time I remove the bevel box I drag the foam ring back into position with a piece of wire. Easy reassembly, and no risk of leaving loose metal objects or pieces of string in there. IMHO it's worth the initial bit of effort.