My neighbor's mags gave it up, and he's short of capital until next month. I have a relatively new set of 4301's with impulse couplings on both, so I loaned him mine (I'll not need them for a while, yet). At his insistance, they will be returned to me with fresh inspections, after his replacements arrive and are installed. I'll give him the above info!
Its the best deal I've found, and great customer service into the bargain.
Reg