[Coachmac]

I have searched and searched, can't find anything about this. For our arm, we are looking at using the van door motor and mounting the Parker cylinder to it. Is it against the rules to bore out the mounting pin on the end of the cylinder? We are wanting to bore that out and mount it directly to the shaft of the van door motor. Is this allowed? Also, any weaknesses to the van door motor we should know about? Thanks