Awhile ago, my daughter's side-by-side home fridge-freezer went warm. We could hear compressor trying to start, klix-on opening, closing than another start attempt. With their cheapest-of-the-cheap Harbor Fright clamp-on, I found it was at LRA. Took the little Start Module off wondering if it was bad. When I shook it and a sand-like material came out (probably a disintegrated PTCR), I decided testing time was over and a parts run was in order. Not too many appliance parts shops in ANC, but "K Appliance" had a SUPCO device.
Might have been URCO210 "3N'1", but when I installed it the compressor started and it's run since around 1999. The K man mentioned that older appliances can destroy the start assist because their winding resistance increases over the years, amperage along with it.
Just read where SUPCO has Potential Relay Hard Start Kits. These are Three-Wire "True" potential relay units, which should provide better results than "E-Series" and the PTCR stuff.
LINKThey show it as equivalent to the "5-2-1" units we've mentioned.