I know this is a bit dated, but I have not been able to get confirmation that Abbott has one of these exit blocks with the guards. However, I did find this on the APS site: Harken 30mm Protexit Single Thru Deck Block (APSLTD SKU - H1200). It looks much better than the stock with an aluminum roller wheel and housing, so no plastic to burn thru. Kinda spendy, but hope that this is a long term upgrade.
Also have been experiencing halyard jams during both the set and douse - anyone ever find a cluprit other than a twisted halyard or blown exit block?
Chris