RE: PICCO .90 QUESTION
If it was already build for a gas-engine :
Buy the Zenoahmount that belonged to the existing drills.
Buy a foot of 3/8"x 3/8" bar stock , make bars that fit between the front and aft part of the Zenoah-mount ,
put the Picco on the bars , drill and tap , and there is your perfect 5" Nitro-mount.
If Zenoah-drills or the midsection-cut is not convenient , you can add 1/8"sheet to cover that.
When ordering metric-bearings for the Picco , ordering C3 fit , polyamide or phenolic retainer and RS shields is VITAL.
The inner shield has to come off , 2nd shield is always on the OUTside.